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diff --git a/Marlin/src/gcode/feature/macro/M810-M819.cpp b/Marlin/src/gcode/feature/macro/M810-M819.cpp
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+++ b/Marlin/src/gcode/feature/macro/M810-M819.cpp
@@ -0,0 +1,65 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(GCODE_MACROS)
+
+#include "../../gcode.h"
+#include "../../queue.h"
+#include "../../parser.h"
+
+char gcode_macros[GCODE_MACROS_SLOTS][GCODE_MACROS_SLOT_SIZE + 1] = {{ 0 }};
+
+/**
+ * M810_819: Set/execute a G-code macro.
+ *
+ * Usage:
+ *   M810 <command>|...   Set Macro 0 to the given commands, separated by the pipe character
+ *   M810                 Execute Macro 0
+ */
+void GcodeSuite::M810_819() {
+  const uint8_t index = parser.codenum - 810;
+  if (index >= GCODE_MACROS_SLOTS) return;
+
+  const size_t len = strlen(parser.string_arg);
+
+  if (len) {
+    // Set a macro
+    if (len > GCODE_MACROS_SLOT_SIZE)
+      SERIAL_ERROR_MSG("Macro too long.");
+    else {
+      char c, *s = parser.string_arg, *d = gcode_macros[index];
+      do {
+        c = *s++;
+        *d++ = c == '|' ? '\n' : c;
+      } while (c);
+    }
+  }
+  else {
+    // Execute a macro
+    char * const cmd = gcode_macros[index];
+    if (strlen(cmd)) process_subcommands_now(cmd);
+  }
+}
+
+#endif // GCODE_MACROS