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diff --git a/Marlin/src/gcode/config/M305.cpp b/Marlin/src/gcode/config/M305.cpp
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+++ b/Marlin/src/gcode/config/M305.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 HAS_USER_THERMISTORS
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
+/**
+ * M305: Set (or report) custom thermistor parameters
+ *
+ *   P[index]  Thermistor table index
+ *   R[ohms]   Pullup resistor value
+ *   T[ohms]   Resistance at 25C
+ *   B[beta]   Thermistor "beta" value
+ *   C[coeff]  Steinhart-Hart Coefficient 'C'
+ *
+ *   Format: M305 P[tbl_index] R[pullup_resistor_val] T[therm_25C_resistance] B[therm_beta] C[Steinhart_Hart_C_coeff]
+ *
+ * Examples: M305 P0 R4700 T100000 B3950 C0.0
+ *           M305 P0 R4700
+ *           M305 P0 T100000
+ *           M305 P0 B3950
+ *           M305 P0 C0.0
+ */
+void GcodeSuite::M305() {
+  const int8_t t_index = parser.intval('P', -1);
+  const bool do_set = parser.seen("BCRT");
+
+  // A valid P index is required
+  if (t_index >= (USER_THERMISTORS) || (do_set && t_index < 0)) {
+    SERIAL_ECHO_START();
+    SERIAL_ECHOLNPAIR("!Invalid index. (0 <= P <= ", int(USER_THERMISTORS - 1), ")");
+  }
+  else if (do_set) {
+    if (parser.seen('R')) // Pullup resistor value
+      if (!thermalManager.set_pull_up_res(t_index, parser.value_float()))
+        SERIAL_ECHO_MSG("!Invalid series resistance. (0 < R < 1000000)");
+
+    if (parser.seen('T')) // Resistance at 25C
+      if (!thermalManager.set_res25(t_index, parser.value_float()))
+        SERIAL_ECHO_MSG("!Invalid 25C resistance. (0 < T < 10000000)");
+
+    if (parser.seen('B')) // Beta value
+      if (!thermalManager.set_beta(t_index, parser.value_float()))
+        SERIAL_ECHO_MSG("!Invalid beta. (0 < B < 1000000)");
+
+    if (parser.seen('C')) // Steinhart-Hart C coefficient
+      if (!thermalManager.set_sh_coeff(t_index, parser.value_float()))
+        SERIAL_ECHO_MSG("!Invalid Steinhart-Hart C coeff. (-0.01 < C < +0.01)");
+  }                       // If not setting then report parameters
+  else if (t_index < 0) { // ...all user thermistors
+    LOOP_L_N(i, USER_THERMISTORS)
+      thermalManager.log_user_thermistor(i);
+  }
+  else                    // ...one user thermistor
+    thermalManager.log_user_thermistor(t_index);
+}
+
+#endif // HAS_USER_THERMISTORS