diff --git a/data/schemas/keyboard.jsonschema b/data/schemas/keyboard.jsonschema
index ec03a8828be..3034242fd9d 100644
--- a/data/schemas/keyboard.jsonschema
+++ b/data/schemas/keyboard.jsonschema
@@ -25,7 +25,7 @@
         },
         "processor": {
             "type": "string",
-            "enum": ["cortex-m0", "cortex-m0plus", "cortex-m3", "cortex-m4", "MKL26Z64", "MK20DX128", "MK20DX256", "STM32F042", "STM32F072", "STM32F103", "STM32F303", "STM32F401", "STM32F411", "STM32G431", "STM32G474", "atmega16u2", "atmega32u2", "atmega16u4", "atmega32u4", "at90usb162", "at90usb646", "at90usb647", "at90usb1286", "at90usb1287", "atmega32a", "atmega328p", "atmega328", "attiny85", "unknown"]
+            "enum": ["cortex-m0", "cortex-m0plus", "cortex-m3", "cortex-m4", "MKL26Z64", "MK20DX128", "MK20DX256", "MK66F18", "STM32F042", "STM32F072", "STM32F103", "STM32F303", "STM32F401", "STM32F411", "STM32G431", "STM32G474", "atmega16u2", "atmega32u2", "atmega16u4", "atmega32u4", "at90usb162", "at90usb646", "at90usb647", "at90usb1286", "at90usb1287", "atmega32a", "atmega328p", "atmega328", "attiny85", "unknown"]
         },
         "board": {
             "type": "string",
diff --git a/lib/python/qmk/constants.py b/lib/python/qmk/constants.py
index 3ed69f3bf95..b5cdaf6a600 100644
--- a/lib/python/qmk/constants.py
+++ b/lib/python/qmk/constants.py
@@ -10,7 +10,7 @@ QMK_FIRMWARE = Path.cwd()
 MAX_KEYBOARD_SUBFOLDERS = 5
 
 # Supported processor types
-CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F411', 'STM32G431', 'STM32G474'
+CHIBIOS_PROCESSORS = 'cortex-m0', 'cortex-m0plus', 'cortex-m3', 'cortex-m4', 'MKL26Z64', 'MK20DX128', 'MK20DX256', 'MK66F18', 'STM32F042', 'STM32F072', 'STM32F103', 'STM32F303', 'STM32F401', 'STM32F411', 'STM32G431', 'STM32G474'
 LUFA_PROCESSORS = 'at90usb162', 'atmega16u2', 'atmega32u2', 'atmega16u4', 'atmega32u4', 'at90usb646', 'at90usb647', 'at90usb1286', 'at90usb1287', None
 VUSB_PROCESSORS = 'atmega32a', 'atmega328p', 'atmega328', 'attiny85'
 
diff --git a/quantum/mcu_selection.mk b/quantum/mcu_selection.mk
index f7329fc4d9f..53e03a8054d 100644
--- a/quantum/mcu_selection.mk
+++ b/quantum/mcu_selection.mk
@@ -81,6 +81,33 @@ ifneq ($(findstring MK20DX256, $(MCU)),)
   BOARD ?= PJRC_TEENSY_3_1
 endif
 
+ifneq ($(findstring MK66F18, $(MCU)),)
+  # Cortex version
+  MCU = cortex-m4
+
+  # ARM version, CORTEX-M0/M1 are 6, CORTEX-M3/M4/M7 are 7
+  ARMV = 7
+
+  ## chip/board settings
+  # - the next two should match the directories in
+  #   <chibios>/os/hal/ports/$(MCU_FAMILY)/$(MCU_SERIES)
+  MCU_FAMILY = KINETIS
+  MCU_SERIES = MK66F18
+
+  # Linker script to use
+  # - it should exist either in <chibios>/os/common/ports/ARMCMx/compilers/GCC/ld/
+  #   or <keyboard_dir>/ld/
+  MCU_LDSCRIPT ?= MK66FX1M0
+
+  # Startup code to use
+  #  - it should exist in <chibios>/os/common/startup/ARMCMx/compilers/GCC/mk/
+  MCU_STARTUP ?= MK66F18
+
+  # Board: it should exist either in <chibios>/os/hal/boards/,
+  # <keyboard_dir>/boards/, or drivers/boards/
+  BOARD ?= PJRC_TEENSY_3_6
+endif
+
 ifneq ($(findstring STM32F042, $(MCU)),)
   # Cortex version
   MCU = cortex-m0
diff --git a/tmk_core/common/chibios/bootloader.c b/tmk_core/common/chibios/bootloader.c
index 6cabcc4b81b..4a175a62834 100644
--- a/tmk_core/common/chibios/bootloader.c
+++ b/tmk_core/common/chibios/bootloader.c
@@ -79,7 +79,7 @@ void enter_bootloader_mode_if_requested(void) {
     }
 }
 
-#elif defined(KL2x) || defined(K20x)  // STM32_BOOTLOADER_DUAL_BANK // STM32_BOOTLOADER_ADDRESS
+#elif defined(KL2x) || defined(K20x) || defined(MK66F18)  // STM32_BOOTLOADER_DUAL_BANK // STM32_BOOTLOADER_ADDRESS
 /* Kinetis */
 
 #    if defined(BOOTLOADER_KIIBOHD)
diff --git a/tmk_core/common/chibios/chibios_config.h b/tmk_core/common/chibios/chibios_config.h
index 9a66ac3174f..1d8ace49556 100644
--- a/tmk_core/common/chibios/chibios_config.h
+++ b/tmk_core/common/chibios/chibios_config.h
@@ -32,3 +32,7 @@
 #    define USE_GPIOV1
 #    define STM32_SYSCLK KINETIS_SYSCLK_FREQUENCY
 #endif
+
+#if defined(MK66F18)
+#    define STM32_SYSCLK KINETIS_SYSCLK_FREQUENCY
+#endif