diff --git a/Marlin/src/core/language.h b/Marlin/src/core/language.h
index 3a9a24a51c..f64c7513df 100644
--- a/Marlin/src/core/language.h
+++ b/Marlin/src/core/language.h
@@ -324,6 +324,7 @@
 #define STR_TEMPERATURE_UNITS               "Temperature Units"
 #define STR_USER_THERMISTORS                "User thermistors"
 #define STR_DELAYED_POWEROFF                "Delayed poweroff"
+#define STR_STORED_MACROS                   "Stored macros"
 
 //
 // General axis names
diff --git a/Marlin/src/gcode/feature/macro/M820.cpp b/Marlin/src/gcode/feature/macro/M820.cpp
new file mode 100644
index 0000000000..9759f482ec
--- /dev/null
+++ b/Marlin/src/gcode/feature/macro/M820.cpp
@@ -0,0 +1,52 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(GCODE_MACROS)
+
+#include "../../gcode.h"
+#include "../../queue.h"
+#include "../../parser.h"
+
+extern char gcode_macros[GCODE_MACROS_SLOTS][GCODE_MACROS_SLOT_SIZE + 1];
+
+/**
+ * M820: List defined M810 - M819 macros
+ */
+void GcodeSuite::M820() {
+  SERIAL_ECHOLNPGM(STR_STORED_MACROS);
+  bool some = false;
+  for (uint8_t i = 0; i < GCODE_MACROS_SLOTS; ++i) {
+    const char *cmd = gcode_macros[i];
+    if (*cmd) {
+      SERIAL_ECHO(F("M81"), i, C(' '));
+      char c;
+      while ((c = *cmd++)) SERIAL_CHAR(c == '\n' ? '|' : c);
+      SERIAL_EOL();
+      some = true;
+    }
+  }
+  if (!some) SERIAL_ECHOLNPGM("None");
+}
+
+#endif // GCODE_MACROS
diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index 1a840e8b81..9fed4dcada 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -1010,6 +1010,7 @@ void GcodeSuite::process_parsed_command(const bool no_ok/*=false*/) {
         case 810: case 811: case 812: case 813: case 814:
         case 815: case 816: case 817: case 818: case 819:
         M810_819(); break;                                        // M810-M819: Define/execute G-code macro
+        case 820: M820(); break;                                  // M820: Report macros to serial output
       #endif
 
       #if HAS_BED_PROBE
diff --git a/Marlin/src/gcode/gcode.h b/Marlin/src/gcode/gcode.h
index 2f72564997..c6b4a40d9f 100644
--- a/Marlin/src/gcode/gcode.h
+++ b/Marlin/src/gcode/gcode.h
@@ -1194,6 +1194,7 @@ private:
 
   #if ENABLED(GCODE_MACROS)
     static void M810_819();
+    static void M820();
   #endif
 
   #if HAS_BED_PROBE