diff --git a/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/board.c b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/board.c
new file mode 100644
index 000000000000..b44a1ae51e04
--- /dev/null
+++ b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/board.c
@@ -0,0 +1,9 @@
+// This file is part of the CircuitPython project: https://circuitpython.org
+//
+// SPDX-FileCopyrightText: Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include "supervisor/board.h"
+
+// Use the MP_WEAK supervisor/shared/board.c versions of routines not defined here.
diff --git a/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.h b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.h
new file mode 100644
index 000000000000..31559f318ada
--- /dev/null
+++ b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.h
@@ -0,0 +1,33 @@
+
+#pragma once
+
+#define MICROPY_HW_BOARD_NAME "Microchip Curiosity CircuitPython Nano"
+#define MICROPY_HW_MCU_NAME "same51j20"
+#define CIRCUITPY_MCU_FAMILY samd51
+
+#define MICROPY_HW_LED_STATUS   (&pin_PB23)
+#define MICROPY_HW_NEOPIXEL (&pin_PB22)
+
+#define BOARD_HAS_CRYSTAL 1
+
+// USB is always used internally so skip the pin objects for it.
+#define IGNORE_PIN_PA24     1
+#define IGNORE_PIN_PA25     1
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PB30)
+#define DEFAULT_I2C_BUS_SDA (&pin_PB31)
+
+#define CIRCUITPY_BOARD_SPI         (3)
+// These correspond to the CIRCUITPY_BOARD_BUS_SINGLETON definitions in pins.c
+#define CIRCUITPY_BOARD_SPI_PIN     { \
+        {.clock = &pin_PB03, .mosi = &pin_PB02, .miso = &pin_PB00}, /*board.SPI()*/ \
+        {.clock = &pin_PA05, .mosi = &pin_PA04, .miso = NULL},      /*board.LCD_SPI()*/ \
+        {.clock = &pin_PA17, .mosi = &pin_PA16, .miso = &pin_PA18}, /*board.SD_SPI()*/ \
+}
+
+#define DEFAULT_CAN_BUS_TX (&pin_PB12)
+#define DEFAULT_CAN_BUS_RX (&pin_PB13)
+#define DEFAULT_CAN_BUS_STDBY (&pin_PB17)
+
+#define DEFAULT_UART_BUS_RX (&pin_PA23)
+#define DEFAULT_UART_BUS_TX (&pin_PA22)
diff --git a/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.mk b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.mk
new file mode 100644
index 000000000000..1a39d6ac11a4
--- /dev/null
+++ b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/mpconfigboard.mk
@@ -0,0 +1,33 @@
+USB_VID = 0x04D8
+USB_PID = 0xE52B
+USB_PRODUCT = "Microchip Curiosity CircuitPython Nano"
+USB_MANUFACTURER = "Microchip Technology Inc"
+
+CHIP_VARIANT = SAME51J20A
+CHIP_FAMILY = same51
+
+# QSPI_FLASH_FILESYSTEM = 1
+INTERNAL_FLASH_FILESYSTEM = 1
+EXTERNAL_FLASH_DEVICES = "SST26VF016B,SST26VF032B,SST26VF064B"
+LONGINT_IMPL = MPZ
+CIRCUITPY_ULAB = 0
+
+CIRCUITPY__EVE = 1
+CIRCUITPY_BITMAPFILTER = 0
+CIRCUITPY_CANIO = 1
+CIRCUITPY_FLOPPYIO = 0
+CIRCUITPY_SYNTHIO = 0
+CIRCUITPY_GIFIO = 0
+CIRCUITPY_JPEGIO = 0
+
+CIRCUITPY_LTO_PARTITION = one
+
+# We don't have room for the fonts for terminalio for certain languages,
+# so turn off terminalio, and if it's off and displayio is on,
+# force a clean build.
+# Note that we cannot test $(CIRCUITPY_DISPLAYIO) directly with an
+# ifeq, because it's not set yet.
+ifneq (,$(filter $(TRANSLATION),ja ko ru))
+CIRCUITPY_TERMINALIO = 0
+RELEASE_NEEDS_CLEAN_BUILD = $(CIRCUITPY_DISPLAYIO)
+endif
diff --git a/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/pins.c b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/pins.c
new file mode 100644
index 000000000000..b4184e3cecd3
--- /dev/null
+++ b/ports/atmel-samd/boards/microchip_curiosity_circuitpython_nano/pins.c
@@ -0,0 +1,88 @@
+// This file is part of the CircuitPython project: https://circuitpython.org
+//
+// SPDX-FileCopyrightText: Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include "shared-bindings/board/__init__.h"
+
+// The singleton for board.SPI() is already defined.
+// board.LCD_SPI()
+CIRCUITPY_BOARD_BUS_SINGLETON(lcd_spi, spi, 1)
+// board.SD_SPI()
+CIRCUITPY_BOARD_BUS_SINGLETON(sd_spi, spi, 2)
+
+static const mp_rom_map_elem_t board_module_globals_table[] = {
+    CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
+
+    { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_PA15) },
+    { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_PA20) },
+    { MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_PA21) },
+    { MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_PA27) },
+    { MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_PB14) },
+    { MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_PB15) },
+    { MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_PB16) },
+    { MP_ROM_QSTR(MP_QSTR_D7), MP_ROM_PTR(&pin_PB17) },
+    { MP_ROM_QSTR(MP_QSTR_D8), MP_ROM_PTR(&pin_PB22) },
+    { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_PB23) },
+
+    { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_PB23) },
+
+    { MP_ROM_QSTR(MP_QSTR_NEOPIX), MP_ROM_PTR(&pin_PB22) },
+
+    { MP_ROM_QSTR(MP_QSTR_VREF), MP_ROM_PTR(&pin_PA03) },
+
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_PB04) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_PB05) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_PB06) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_PB07) },
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_PB08) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_PB09) },
+
+    { MP_ROM_QSTR(MP_QSTR_DAC), MP_ROM_PTR(&pin_PA02) },
+
+    { MP_ROM_QSTR(MP_QSTR_CAP1), MP_ROM_PTR(&pin_PB09) },
+
+    { MP_ROM_QSTR(MP_QSTR_LCD_CS), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_LCD_MOSI), MP_ROM_PTR(&pin_PA04) },
+    { MP_ROM_QSTR(MP_QSTR_LCD_SCK), MP_ROM_PTR(&pin_PA05) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PB30) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PB31) },
+
+    { MP_ROM_QSTR(MP_QSTR_BLE_TX), MP_ROM_PTR(&pin_PA12) },
+    { MP_ROM_QSTR(MP_QSTR_BLE_RX), MP_ROM_PTR(&pin_PA13) },
+    { MP_ROM_QSTR(MP_QSTR_BLE_CLR), MP_ROM_PTR(&pin_PA14) },
+
+    { MP_ROM_QSTR(MP_QSTR_SD_MOSI), MP_ROM_PTR(&pin_PA16) },
+    { MP_ROM_QSTR(MP_QSTR_SD_MISO), MP_ROM_PTR(&pin_PA18) },
+    { MP_ROM_QSTR(MP_QSTR_SD_SCK), MP_ROM_PTR(&pin_PA17) },
+    { MP_ROM_QSTR(MP_QSTR_SD_CS), MP_ROM_PTR(&pin_PA19) },
+
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PB00) },
+    { MP_ROM_QSTR(MP_QSTR_SPARE_0), MP_ROM_PTR(&pin_PB00) },
+
+    { MP_ROM_QSTR(MP_QSTR_CS), MP_ROM_PTR(&pin_PB01) },
+    { MP_ROM_QSTR(MP_QSTR_SPARE_1), MP_ROM_PTR(&pin_PB01) },
+
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PB02) },
+    { MP_ROM_QSTR(MP_QSTR_SPARE_2), MP_ROM_PTR(&pin_PB02) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_PB03) },
+    { MP_ROM_QSTR(MP_QSTR_SPARE_3), MP_ROM_PTR(&pin_PB03) },
+
+    { MP_ROM_QSTR(MP_QSTR_DEBUG_TX), MP_ROM_PTR(&pin_PA22) },
+    { MP_ROM_QSTR(MP_QSTR_DEBUG_RX), MP_ROM_PTR(&pin_PA23) },
+
+    { MP_OBJ_NEW_QSTR(MP_QSTR_CAN_RX),  MP_ROM_PTR(&pin_PB13) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_CAN_TX),  MP_ROM_PTR(&pin_PB12) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_CAN_STANDBY),  MP_ROM_PTR(&pin_PB17) },
+
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
+
+    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
+    { MP_ROM_QSTR(MP_QSTR_LCD_SPI), MP_ROM_PTR(&board_lcd_spi_obj) },
+    { MP_ROM_QSTR(MP_QSTR_SD_SPI), MP_ROM_PTR(&board_sd_spi_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);