Lake of the Woods 31H

{{Use Canadian English|date=January 2023}}

{{Infobox settlement

| name = Lake of the Woods 31H

| official_name = Lake of the Woods Indian Reserve No. 31H

| settlement_type = Indian reserve

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| map_caption =

| pushpin_map = Canada Ontario

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| pushpin_mapsize = 200

| coordinates = {{coord|49|07|N|94|43|W|region:CA-ON|display=inline,title}}

| subdivision_type = Country

| subdivision_name = {{CAN}}

| subdivision_type1 = Province

| subdivision_name1 = {{ON}}

| subdivision_type2 = District

| subdivision_name2 = Rainy River

| subdivision_type3 = First Nation

| subdivision_name3 = Naongashiing

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| area_land_km2 = 9.64

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| population_as_of = 2011

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Lake of the Woods 31H is a First Nations reserve on Big Island in Lake of the Woods, northwestern Ontario. It is one of the reserves of the Anishnaabeg of Naongashiing.