diff --git a/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h b/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h
new file mode 100644
index 0000000000..fc047880d1
--- /dev/null
+++ b/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.h
@@ -0,0 +1,64 @@
+/* This file is part of the MicroPython project, http://micropython.org/
+ * MIT License; Copyright (c) 2019 Damien P. George
+ */
+
+#define MICROPY_HW_BOARD_NAME       "NUCLEO-WB55"
+#define MICROPY_HW_MCU_NAME         "STM32WB55RGV6"
+
+#define MICROPY_PY_PYB_LEGACY       (0)
+
+#define MICROPY_HW_ENABLE_RTC       (1)
+#define MICROPY_HW_ENABLE_RNG       (1)
+#define MICROPY_HW_ENABLE_ADC       (0)
+#define MICROPY_HW_ENABLE_USB       (1)
+#define MICROPY_HW_HAS_SWITCH       (1)
+
+// There is an external 32kHz oscillator
+#define RTC_ASYNCH_PREDIV           (0)
+#define RTC_SYNCH_PREDIV            (0x7fff)
+#define MICROPY_HW_RTC_USE_LSE      (1)
+#define MICROPY_HW_RTC_USE_US       (1)
+
+// UART buses
+#define MICROPY_HW_UART1_TX         (pin_B6)
+#define MICROPY_HW_UART1_RX         (pin_B7)
+// USART 1 is connected to the virtual com port on the ST-LINK
+#define MICROPY_HW_UART_REPL        PYB_UART_1
+#define MICROPY_HW_UART_REPL_BAUD   115200
+
+// I2C buses
+#define MICROPY_HW_I2C1_SCL         (pin_B8)    // Arduino D15, pin 3 on CN10
+#define MICROPY_HW_I2C1_SDA         (pin_B9)    // Arduino D14, pin 5 on CN10
+#define MICROPY_HW_I2C3_SCL         (pin_C0)    // Arduino A0, pin 28 on CN7
+#define MICROPY_HW_I2C3_SDA         (pin_C1)    // Arduino A1, pin 30 on CN7
+
+// SPI buses
+#if 0 // TODO need working DMA
+#define MICROPY_HW_SPI1_NSS         (pin_A4)    // Arduino D10  pin 17 on CN10
+#define MICROPY_HW_SPI1_SCK         (pin_A5)    // Arduino D13, pin 11 on CN10
+#define MICROPY_HW_SPI1_MISO        (pin_A6)    // Arduino D12, pin 13 on CN10
+#define MICROPY_HW_SPI1_MOSI        (pin_A7)    // Arduino D11, pin 15 on CN10
+#define MICROPY_HW_SPI2_NSS         (pin_B12)   //              pin 16 on CN10
+#define MICROPY_HW_SPI2_SCK         (pin_B13)   //              pin 30 on CN10
+#define MICROPY_HW_SPI2_MISO        (pin_B14)   //              pin 28 on CN10
+#define MICROPY_HW_SPI2_MOSI        (pin_B15)   //              pin 26 on CN10
+#endif
+
+// User switch; pressing the button makes the input go low
+#define MICROPY_HW_USRSW_PIN        (pin_C4)
+#define MICROPY_HW_USRSW_PULL       (GPIO_PULLUP)
+#define MICROPY_HW_USRSW_EXTI_MODE  (GPIO_MODE_IT_FALLING)
+#define MICROPY_HW_USRSW_PRESSED    (0)
+
+// LEDs
+#define MICROPY_HW_LED1             (pin_B1) // red
+#define MICROPY_HW_LED2             (pin_B0) // green
+#define MICROPY_HW_LED3             (pin_B5) // blue
+#define MICROPY_HW_LED_ON(pin)      (mp_hal_pin_high(pin))
+#define MICROPY_HW_LED_OFF(pin)     (mp_hal_pin_low(pin))
+
+// USB config
+#define MICROPY_HW_USB_FS           (1)
+#define MICROPY_HW_USB_HID          (0)
+#define USBD_CDC_RX_DATA_SIZE       (512)
+#define USBD_CDC_TX_DATA_SIZE       (512)
diff --git a/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.mk b/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.mk
new file mode 100644
index 0000000000..b0f93c006f
--- /dev/null
+++ b/ports/stm32/boards/NUCLEO_WB55/mpconfigboard.mk
@@ -0,0 +1,5 @@
+MCU_SERIES = wb
+CMSIS_MCU = STM32WB55xx
+AF_FILE = boards/stm32wb55_af.csv
+LD_FILES = boards/stm32wb55xg.ld boards/common_basic.ld
+STARTUP_FILE = lib/stm32lib/CMSIS/STM32WBxx/Source/Templates/gcc/startup_stm32wb55xx_cm4.o
diff --git a/ports/stm32/boards/NUCLEO_WB55/pins.csv b/ports/stm32/boards/NUCLEO_WB55/pins.csv
new file mode 100644
index 0000000000..49fdab0c28
--- /dev/null
+++ b/ports/stm32/boards/NUCLEO_WB55/pins.csv
@@ -0,0 +1,34 @@
+,PA0
+,PA1
+,PA2
+,PA3
+,PA4
+,PA5
+,PA6
+,PA7
+,PB0
+,PB1
+,PB2
+,PB3
+,PB4
+,PB5
+,PB6
+,PB7
+,PB8
+,PB9
+,PB10
+,PB11
+,PB12
+,PB13
+,PB14
+,PB15
+,PC0
+,PC1
+,PC2
+,PC3
+SW,PC4
+LED_GREEN,PB0
+LED_RED,PB1
+LED_BLUE,PB5
+USB_DM,PA11
+USB_DP,PA12
diff --git a/ports/stm32/boards/NUCLEO_WB55/stm32wbxx_hal_conf.h b/ports/stm32/boards/NUCLEO_WB55/stm32wbxx_hal_conf.h
new file mode 100644
index 0000000000..176857220e
--- /dev/null
+++ b/ports/stm32/boards/NUCLEO_WB55/stm32wbxx_hal_conf.h
@@ -0,0 +1,19 @@
+/* This file is part of the MicroPython project, http://micropython.org/
+ * The MIT License (MIT)
+ * Copyright (c) 2019 Damien P. George
+ */
+#ifndef MICROPY_INCLUDED_STM32WBXX_HAL_CONF_H
+#define MICROPY_INCLUDED_STM32WBXX_HAL_CONF_H
+
+// Oscillator values in Hz
+#define HSE_VALUE (32000000)
+#define LSE_VALUE (32768)
+#define EXTERNAL_SAI1_CLOCK_VALUE (48000)
+
+// Oscillator timeouts in ms
+#define HSE_STARTUP_TIMEOUT (100)
+#define LSE_STARTUP_TIMEOUT (5000)
+
+#include "boards/stm32wbxx_hal_conf_base.h"
+
+#endif // MICROPY_INCLUDED_STM32WBXX_HAL_CONF_H