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diff --git a/Marlin/src/gcode/config/M575.cpp b/Marlin/src/gcode/config/M575.cpp
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+++ b/Marlin/src/gcode/config/M575.cpp
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+/**
+ * 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(BAUD_RATE_GCODE)
+
+#include "../gcode.h"
+
+/**
+ * M575 - Change serial baud rate
+ *
+ *   P<index>    - Serial port index. Omit for all.
+ *   B<baudrate> - Baud rate (bits per second)
+ */
+void GcodeSuite::M575() {
+  int32_t baud = parser.ulongval('B');
+  switch (baud) {
+    case   24:
+    case   96:
+    case  192:
+    case  384:
+    case  576:
+    case 1152: baud *= 100; break;
+    case  250:
+    case  500: baud *= 1000; break;
+    case   19: baud = 19200; break;
+    case   38: baud = 38400; break;
+    case   57: baud = 57600; break;
+    case  115: baud = 115200; break;
+  }
+  switch (baud) {
+    case 2400: case 9600: case 19200: case 38400: case 57600:
+    case 115200: case 250000: case 500000: case 1000000: {
+      const int8_t port = parser.intval('P', -99);
+      const bool set0 = (port == -99 || port == 0);
+      if (set0) SERIAL_ECHO_MSG(" Serial ", '0', " baud rate set to ", baud);
+      #if HAS_MULTI_SERIAL
+        const bool set1 = (port == -99 || port == 1);
+        if (set1) SERIAL_ECHO_MSG(" Serial ", '1', " baud rate set to ", baud);
+      #endif
+
+      SERIAL_FLUSH();
+
+      if (set0) { MYSERIAL0.end(); MYSERIAL0.begin(baud); }
+
+      #if HAS_MULTI_SERIAL
+        if (set1) { MYSERIAL1.end(); MYSERIAL1.begin(baud); }
+      #endif
+
+    } break;
+    default: SERIAL_ECHO_MSG("?(B)aud rate implausible.");
+  }
+}
+
+#endif // BAUD_RATE_GCODE