diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index bce45851d..d0f988c17 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -292,6 +292,7 @@
 #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
 #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.
 
+//#define SDCARD_SORT_ALPHA // Sort SD file listings in ASCII order. Find additional options in cardreader.h
 #define SDCARD_RATHERRECENTFIRST  //reverse file order of sd card menu display. Its sorted practically after the file system block order.
 // if a file is deleted, it frees a block. hence, the order is not purely chronological. To still have auto0.g accessible, there is again the option to do that.
 // using:
diff --git a/Marlin/SdFatConfig.h b/Marlin/SdFatConfig.h
index 710b1f792..39ef38130 100644
--- a/Marlin/SdFatConfig.h
+++ b/Marlin/SdFatConfig.h
@@ -111,10 +111,12 @@ uint8_t const SOFT_SPI_SCK_PIN = 13;
 /**
  * Defines for long (vfat) filenames
  */
+/** Number of UTF-16 characters per entry */
+#define FILENAME_LENGTH 13
 /** Number of VFAT entries used. Every entry has 13 UTF-16 characters */
 #define MAX_VFAT_ENTRIES (2)
 /** Total size of the buffer used to store the long filenames */
-#define LONG_FILENAME_LENGTH (13*MAX_VFAT_ENTRIES+1)
+#define LONG_FILENAME_LENGTH (FILENAME_LENGTH*MAX_VFAT_ENTRIES+1)
 #endif  // SdFatConfig_h
 
 
diff --git a/Marlin/cardreader.cpp b/Marlin/cardreader.cpp
index d2fb418fb..57a91040b 100644
--- a/Marlin/cardreader.cpp
+++ b/Marlin/cardreader.cpp
@@ -11,6 +11,9 @@
 
 CardReader::CardReader()
 {
+  #ifdef SDCARD_SORT_ALPHA
+   sort_count = 0;
+  #endif
    filesize = 0;
    sdpos = 0;
    sdprinting = false;
@@ -33,19 +36,15 @@ CardReader::CardReader()
   autostart_atmillis=millis()+5000;
 }
 
-char *createFilename(char *buffer,const dir_t &p) //buffer>12characters
+char *createFilename(char *buffer, const dir_t &p) //buffer>12characters
 {
   char *pos=buffer;
-  for (uint8_t i = 0; i < 11; i++) 
-  {
-    if (p.name[i] == ' ')continue;
-    if (i == 8) 
-    {
-      *pos++='.';
-    }
-    *pos++=p.name[i];
+  for (uint8_t i = 0; i < 11; i++) {
+    if (p.name[i] == ' ') continue;
+    if (i == 8) *pos++ = '.';
+    *pos++ = p.name[i];
   }
-  *pos++=0;
+  *pos++ = 0;
   return buffer;
 }
 
@@ -53,15 +52,15 @@ char *createFilename(char *buffer,const dir_t &p) //buffer>12characters
 void  CardReader::lsDive(const char *prepend,SdFile parent)
 {
   dir_t p;
- uint8_t cnt=0;
+  uint8_t cnt=0;
  
   while (parent.readDir(p, longFilename) > 0)
   {
     if( DIR_IS_SUBDIR(&p) && lsAction!=LS_Count && lsAction!=LS_GetFilename) // hence LS_SerialPrint
     {
 
-      char path[13*2];
-      char lfilename[13];
+      char path[FILENAME_LENGTH*2];
+      char lfilename[FILENAME_LENGTH];
       createFilename(lfilename,p);
       
       path[0]=0;
@@ -87,8 +86,6 @@ void  CardReader::lsDive(const char *prepend,SdFile parent)
       }
       lsDive(path,dir);
       //close done automatically by destructor of SdFile
-
-      
     }
     else
     {
@@ -101,11 +98,10 @@ void  CardReader::lsDive(const char *prepend,SdFile parent)
         if ( p.name[1] != '.')
         continue;
       }
-      
+
       if (!DIR_IS_FILE_OR_SUBDIR(&p)) continue;
       filenameIsDir=DIR_IS_SUBDIR(&p);
-      
-      
+
       if(!filenameIsDir)
       {
         if(p.name[8]!='G') continue;
@@ -124,10 +120,8 @@ void  CardReader::lsDive(const char *prepend,SdFile parent)
       } 
       else if(lsAction==LS_GetFilename)
       {
-        if(cnt==nrFiles)
-          return;
+        if (cnt == nrFiles) return;
         cnt++;
-        
       }
     }
   }
@@ -136,9 +130,6 @@ void  CardReader::lsDive(const char *prepend,SdFile parent)
 void CardReader::ls() 
 {
   lsAction=LS_SerialPrint;
-  if(lsAction==LS_Count)
-  nrFiles=0;
-
   root.rewind();
   lsDive("",root);
 }
@@ -177,6 +168,9 @@ void CardReader::initsd()
   }
   workDir=root;
   curDir=&root;
+  #ifdef SDCARD_SORT_ALPHA
+    presort();
+  #endif
   /*
   if(!workDir.openRoot(&volume))
   {
@@ -193,8 +187,10 @@ void CardReader::setroot()
     SERIAL_ECHOLNPGM(MSG_SD_WORKDIR_FAIL);
   }*/
   workDir=root;
-  
   curDir=&workDir;
+  #ifdef SDCARD_SORT_ALPHA
+    presort();
+  #endif
 }
 void CardReader::release()
 {
@@ -207,6 +203,7 @@ void CardReader::startFileprint()
   if(cardOK)
   {
     sdprinting = true;
+    flush_presort();
   }
 }
 
@@ -235,7 +232,7 @@ void CardReader::getAbsFilename(char *t)
     while(*t!=0 && cnt< MAXPATHNAMELENGTH) 
     {t++;cnt++;}  //crawl counter forward.
   }
-  if(cnt<MAXPATHNAMELENGTH-13)
+  if(cnt<MAXPATHNAMELENGTH-FILENAME_LENGTH)
     file.getFilename(t);
   else
     t[0]=0;
@@ -305,7 +302,7 @@ void CardReader::openFile(char* name,bool read, bool replace_current/*=true*/)
       //SERIAL_ECHO("end  :");SERIAL_ECHOLN((int)(dirname_end-name));
       if(dirname_end>0 && dirname_end>dirname_start)
       {
-        char subdirname[13];
+        char subdirname[FILENAME_LENGTH];
         strncpy(subdirname, dirname_start, dirname_end-dirname_start);
         subdirname[dirname_end-dirname_start]=0;
         SERIAL_ECHOLN(subdirname);
@@ -401,7 +398,7 @@ void CardReader::removeFile(char* name)
       //SERIAL_ECHO("end  :");SERIAL_ECHOLN((int)(dirname_end-name));
       if(dirname_end>0 && dirname_end>dirname_start)
       {
-        char subdirname[13];
+        char subdirname[FILENAME_LENGTH];
         strncpy(subdirname, dirname_start, dirname_end-dirname_start);
         subdirname[dirname_end-dirname_start]=0;
         SERIAL_ECHOLN(subdirname);
@@ -439,6 +436,9 @@ void CardReader::removeFile(char* name)
       SERIAL_PROTOCOLPGM("File deleted:");
       SERIAL_PROTOCOLLN(fname);
       sdpos = 0;
+      #ifdef SDCARD_SORT_ALPHA
+        presort();
+      #endif
     }
     else
     {
@@ -552,14 +552,21 @@ void CardReader::closefile(bool store_location)
   
 }
 
-void CardReader::getfilename(const uint8_t nr)
+void CardReader::getfilename(const uint16_t nr)
 {
+  #if defined(SDCARD_SORT_ALPHA) && SORT_USES_RAM && SORT_USES_MORE_RAM
+    if (nr < sort_count) {
+      strcpy(filename, sortshort[nr]);
+      strcpy(longFilename, sortnames[nr]);
+      filenameIsDir = isDir[nr];
+      return;
+    }
+  #endif
   curDir=&workDir;
   lsAction=LS_GetFilename;
   nrFiles=nr;
   curDir->rewind();
   lsDive("",*curDir);
-  
 }
 
 uint16_t CardReader::getnrfilenames()
@@ -577,7 +584,7 @@ void CardReader::chdir(const char * relpath)
 {
   SdFile newfile;
   SdFile *parent=&root;
-  
+
   if(workDir.isOpen())
     parent=&workDir;
   
@@ -595,21 +602,164 @@ void CardReader::chdir(const char * relpath)
       workDirParents[0]=*parent;
     }
     workDir=newfile;
+    #ifdef SDCARD_SORT_ALPHA
+      presort();
+    #endif
   }
 }
 
 void CardReader::updir()
 {
-  if(workDirDepth > 0)
+  if (workDirDepth > 0)
   {
     --workDirDepth;
     workDir = workDirParents[0];
-    int d;
     for (int d = 0; d < workDirDepth; d++)
       workDirParents[d] = workDirParents[d+1];
+    #ifdef SDCARD_SORT_ALPHA
+      presort();
+    #endif
   }
 }
 
+#ifdef SDCARD_SORT_ALPHA
+
+/**
+ * Get the name of a file in the current directory by sort-index
+ */
+void CardReader::getfilename_sorted(const uint16_t nr) {
+  getfilename(nr < sort_count ? sort_order[nr] : nr);
+}
+
+/**
+ * Read all the files and produce a sort key
+ *
+ * We can do this in 3 ways...
+ *  - Minimal RAM: Read two filenames at a time sorting along...
+ *  - Some RAM: Buffer the directory and return filenames from RAM
+ *  - Some RAM: Buffer the directory just for this sort
+ */
+void CardReader::presort()
+{
+  flush_presort();
+
+  uint16_t fileCnt = getnrfilenames();
+  if (fileCnt > 0) {
+
+    if (fileCnt > SORT_LIMIT) fileCnt = SORT_LIMIT;
+
+    #if SORT_USES_RAM
+      #if SORT_USES_MORE_RAM
+        sortshort = (char**)calloc(fileCnt, sizeof(char*));
+        sortnames = (char**)calloc(fileCnt, sizeof(char*));
+      #else
+        char *sortnames[fileCnt];
+      #endif
+    #else
+      char name1[LONG_FILENAME_LENGTH+1];
+    #endif
+
+    #if FOLDER_SORTING != 0
+      #if SORT_USES_RAM && SORT_USES_MORE_RAM
+        isDir = (uint8_t*)calloc(fileCnt, sizeof(uint8_t));
+      #else
+        uint8_t isDir[fileCnt];
+      #endif
+    #endif
+
+    sort_order = new uint8_t[fileCnt];
+
+    if (fileCnt > 1) {
+
+      // Init sort order. If using RAM then read all filenames now.
+      for (uint16_t i=0; i<fileCnt; i++) {
+        sort_order[i] = i;
+        #if SORT_USES_RAM
+          getfilename(i);
+          sortnames[i] = strdup(longFilename[0] ? longFilename : filename);
+          #if SORT_USES_MORE_RAM
+            sortshort[i] = strdup(filename);
+          #endif
+          // char out[30];
+          // sprintf_P(out, PSTR("---- %i %s %s"), i, filenameIsDir ? "D" : " ", sortnames[i]);
+          // SERIAL_ECHOLN(out);
+          #if FOLDER_SORTING != 0
+            isDir[i] = filenameIsDir;
+          #endif
+        #endif
+      }
+
+      // Bubble Sort
+      for (uint16_t i=fileCnt; --i;) {
+        bool cmp, didSwap = false;
+        for (uint16_t j=0; j<i; ++j) {
+          uint16_t s1 = j, s2 = j+1, o1 = sort_order[s1], o2 = sort_order[s2];
+          #if SORT_USES_RAM
+            #if FOLDER_SORTING != 0
+              cmp = (isDir[o1] == isDir[o2]) ? (strcasecmp(sortnames[o1], sortnames[o2]) > 0) : isDir[FOLDER_SORTING > 0 ? o1 : o2];
+            #else
+              cmp = strcasecmp(sortnames[o1], sortnames[o2]) > 0;
+            #endif
+          #else
+            getfilename(o1);
+            strcpy(name1, longFilename[0] ? longFilename : filename);
+            #if FOLDER_SORTING != 0
+              bool dir1 = filenameIsDir;
+            #endif
+            getfilename(o2);
+            char *name2 = longFilename[0] ? longFilename : filename;
+            #if FOLDER_SORTING != 0
+              cmp = (dir1 == filenameIsDir) ? (strcasecmp(name1, name2) > 0) : (FOLDER_SORTING > 0 ? dir1 : !dir1);
+            #else
+              cmp = strcasecmp(name1, name2) > 0;
+            #endif
+          #endif
+          if (cmp) {
+            sort_order[s1] = o2;
+            sort_order[s2] = o1;
+            didSwap = true;
+          }
+        }
+        if (!didSwap) break;
+      }
+
+      #if SORT_USES_RAM && !SORT_USES_MORE_RAM
+        for (uint16_t i=0; i<fileCnt; ++i) free(sortnames[i]);
+      #endif
+    }
+    else {
+      sort_order[0] = 0;
+      #if SORT_USES_RAM && SORT_USES_MORE_RAM
+        sortnames = (char**)malloc(sizeof(char*));
+        sortshort = (char**)malloc(sizeof(char*));
+        isDir = (uint8_t*)malloc(sizeof(uint8_t));
+        getfilename(0);
+        sortnames[0] = strdup(longFilename[0] ? longFilename : filename);
+        sortshort[0] = strdup(filename);
+        isDir[0] = filenameIsDir;
+      #endif
+    }
+
+    sort_count = fileCnt;
+  }
+}
+
+void CardReader::flush_presort() {
+  if (sort_count > 0) {
+    #if SORT_USES_RAM && SORT_USES_MORE_RAM
+      for (uint8_t i=0; i<sort_count; ++i) {
+        free(sortshort[i]);
+        free(sortnames[i]);
+      }
+      free(sortshort);
+      free(sortnames);
+    #endif
+    delete sort_order;
+    sort_count = 0;
+  }
+}
+
+#endif // SDCARD_SORT_ALPHA
 
 void CardReader::printingHasFinished()
 {
@@ -633,6 +783,9 @@ void CardReader::printingHasFinished()
           enquecommand_P(PSTR(SD_FINISHED_RELEASECOMMAND));
       }
       autotempShutdown();
+      #ifdef SDCARD_SORT_ALPHA
+        presort();
+      #endif
     }
 }
 #endif //SDSUPPORT
diff --git a/Marlin/cardreader.h b/Marlin/cardreader.h
index 78f7148b1..f3af6da5b 100644
--- a/Marlin/cardreader.h
+++ b/Marlin/cardreader.h
@@ -3,7 +3,14 @@
 
 #ifdef SDSUPPORT
 
-#define MAX_DIR_DEPTH 10
+#define MAX_DIR_DEPTH 10          // Maximum folder depth
+
+#ifdef SDCARD_SORT_ALPHA
+  #define SORT_USES_RAM false      // Buffer while sorting, else re-read from SD
+  #define SORT_USES_MORE_RAM false // Always keep the directory in RAM
+  #define SORT_LIMIT 256           // Maximum number of sorted items
+  #define FOLDER_SORTING -1        // -1=above  0=none  1=below
+#endif
 
 #include "SdFile.h"
 enum LsAction {LS_SerialPrint,LS_Count,LS_GetFilename};
@@ -28,7 +35,7 @@ public:
   void getStatus();
   void printingHasFinished();
 
-  void getfilename(const uint8_t nr);
+  void getfilename(const uint16_t nr);
   uint16_t getnrfilenames();
   
   void getAbsFilename(char *t);
@@ -39,6 +46,12 @@ public:
   void updir();
   void setroot();
 
+#ifdef SDCARD_SORT_ALPHA
+  void presort();
+  void flush_presort();
+  void getfilename_sorted(const uint16_t nr);
+#endif
+
 
   FORCE_INLINE bool isFileOpen() { return file.isOpen(); }
   FORCE_INLINE bool eof() { return sdpos>=filesize ;};
@@ -50,20 +63,29 @@ public:
 public:
   bool saving;
   bool logging;
-  bool sdprinting ;  
-  bool cardOK ;
-  char filename[13];
+  bool sdprinting;
+  bool cardOK;
+  char filename[FILENAME_LENGTH];
   char longFilename[LONG_FILENAME_LENGTH];
   bool filenameIsDir;
   int lastnr; //last number of the autostart;
 private:
   SdFile root,*curDir,workDir,workDirParents[MAX_DIR_DEPTH];
   uint16_t workDirDepth;
+#ifdef SDCARD_SORT_ALPHA
+  uint16_t sort_count;
+  uint8_t *sort_order;
+  #if SORT_USES_MORE_RAM
+    char **sortshort;
+    char **sortnames;
+    uint8_t *isDir;
+  #endif
+#endif
   Sd2Card card;
   SdVolume volume;
   SdFile file;
   #define SD_PROCEDURE_DEPTH 1
-  #define MAXPATHNAMELENGTH (13*MAX_DIR_DEPTH+MAX_DIR_DEPTH+1)
+  #define MAXPATHNAMELENGTH (FILENAME_LENGTH*MAX_DIR_DEPTH+MAX_DIR_DEPTH+1)
   uint8_t file_subcall_ctr;
   uint32_t filespos[SD_PROCEDURE_DEPTH];
   char filenames[SD_PROCEDURE_DEPTH][MAXPATHNAMELENGTH];
@@ -75,7 +97,7 @@ private:
   bool autostart_stilltocheck; //the sd start is delayed, because otherwise the serial cannot answer fast enought to make contact with the hostsoftware.
   
   LsAction lsAction; //stored for recursion.
-  int16_t nrFiles; //counter for the files in the current directory and recycled as position counter for getting the nrFiles'th name in the directory.
+  uint16_t nrFiles; //counter for the files in the current directory and recycled as position counter for getting the nrFiles'th name in the directory.
   char* diveDirName;
   void lsDive(const char *prepend,SdFile parent);
 };
diff --git a/Marlin/example_configurations/SCARA/Configuration_adv.h b/Marlin/example_configurations/SCARA/Configuration_adv.h
index 7a01bccb6..10fbe9b31 100644
--- a/Marlin/example_configurations/SCARA/Configuration_adv.h
+++ b/Marlin/example_configurations/SCARA/Configuration_adv.h
@@ -295,6 +295,7 @@
 #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
 #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.
 
+//#define SDCARD_SORT_ALPHA // Sort SD file listings in ASCII order. Find additional options in cardreader.h
 #define SDCARD_RATHERRECENTFIRST  //reverse file order of sd card menu display. Its sorted practically after the file system block order.
 // if a file is deleted, it frees a block. hence, the order is not purely chronological. To still have auto0.g accessible, there is again the option to do that.
 // using:
diff --git a/Marlin/example_configurations/delta/Configuration_adv.h b/Marlin/example_configurations/delta/Configuration_adv.h
index ee42481be..6c9d56886 100644
--- a/Marlin/example_configurations/delta/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/Configuration_adv.h
@@ -287,6 +287,7 @@
 #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
 #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.
 
+//#define SDCARD_SORT_ALPHA // Sort SD file listings in ASCII order. Find additional options in cardreader.h
 #define SDCARD_RATHERRECENTFIRST  //reverse file order of sd card menu display. Its sorted practically after the filesystem block order. 
 // if a file is deleted, it frees a block. hence, the order is not purely cronological. To still have auto0.g accessible, there is again the option to do that.
 // using:
diff --git a/Marlin/example_configurations/makibox/Configuration_adv.h b/Marlin/example_configurations/makibox/Configuration_adv.h
index 7883c7999..312b2b964 100644
--- a/Marlin/example_configurations/makibox/Configuration_adv.h
+++ b/Marlin/example_configurations/makibox/Configuration_adv.h
@@ -291,6 +291,7 @@
 #define SD_FINISHED_STEPPERRELEASE true  //if sd support and the file is finished: disable steppers?
 #define SD_FINISHED_RELEASECOMMAND "M84 X Y Z E" // You might want to keep the z enabled so your bed stays in place.
 
+//#define SDCARD_SORT_ALPHA // Sort SD file listings in ASCII order. Find additional options in cardreader.h
 #define SDCARD_RATHERRECENTFIRST  //reverse file order of sd card menu display. Its sorted practically after the file system block order.
 // if a file is deleted, it frees a block. hence, the order is not purely chronological. To still have auto0.g accessible, there is again the option to do that.
 // using:
diff --git a/Marlin/ultralcd.cpp b/Marlin/ultralcd.cpp
index 550b9cb0b..513f493bb 100644
--- a/Marlin/ultralcd.cpp
+++ b/Marlin/ultralcd.cpp
@@ -993,9 +993,9 @@ void lcd_sdcard_menu()
     card.getWorkDirName();
     if(card.filename[0]=='/')
     {
-#if SDCARDDETECT == -1
+      #if SDCARDDETECT == -1
         MENU_ITEM(function, LCD_STR_REFRESH MSG_REFRESH, lcd_sd_refresh);
-#endif
+      #endif
     }else{
         MENU_ITEM(function, LCD_STR_FOLDER "..", lcd_sd_updir);
     }
@@ -1004,16 +1004,23 @@ void lcd_sdcard_menu()
     {
         if (_menuItemNr == _lineNr)
         {
-            #ifndef SDCARD_RATHERRECENTFIRST
-              card.getfilename(i);
+            #if defined(SDCARD_RATHERRECENTFIRST) && !defined(SDCARD_SORT_ALPHA)
+              int nr = fileCnt-1-i;
             #else
-              card.getfilename(fileCnt-1-i);
+              int nr = i;
             #endif
-            if (card.filenameIsDir)
-            {
-                MENU_ITEM(sddirectory, MSG_CARD_MENU, card.filename, card.longFilename);
-            }else{
-                MENU_ITEM(sdfile, MSG_CARD_MENU, card.filename, card.longFilename);
+
+            #ifdef SDCARD_SORT_ALPHA
+              card.getfilename_sorted(nr);
+            #else
+              card.getfilename(nr);
+            #endif
+
+            if (card.filenameIsDir) {
+              MENU_ITEM(sddirectory, MSG_CARD_MENU, card.filename, card.longFilename);
+            }
+            else {
+              MENU_ITEM(sdfile, MSG_CARD_MENU, card.filename, card.longFilename);
             }
         }else{
             MENU_ITEM_DUMMY();
@@ -1219,7 +1226,7 @@ void lcd_init()
   #endif // SR_LCD_2W_NL
 #endif//!NEWPANEL
 
-#if defined (SDSUPPORT) && defined(SDCARDDETECT) && (SDCARDDETECT > 0)
+#if defined(SDSUPPORT) && defined(SDCARDDETECT) && (SDCARDDETECT > 0)
     pinMode(SDCARDDETECT,INPUT);
     WRITE(SDCARDDETECT, HIGH);
     lcd_oldcardstatus = IS_SD_INSERTED;