Big Grassy River 35G

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

{{Infobox settlement

| name = Big Grassy River 35G

| official_name = Big Grassy River Indian Reserve No. 35G

| settlement_type = Indian reserve

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| map_caption =

| pushpin_map = Canada Ontario

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| pushpin_mapsize = 200

| coordinates = {{coord|49|04|N|94|19|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 = Big Grassy

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| area_total_km2 =

| area_land_km2 = 33.73

| area_water_km2 =

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| population_footnotes = {{cite web |url=https://www12.statcan.gc.ca/census-recensement/2021/dp-pd/prof/details/page.cfm?Lang=E&SearchText=Big%20Grassy%20River%2035G&DGUIDlist=2021A00053559051&GENDERlist=1,2,3&STATISTIClist=1,4&HEADERlist=0 |title=Big Grassy River 35G census profile |publisher=Statistics Canada |work=2021 Census of Population |date=9 February 2022 |accessdate=5 May 2024}}

| population_total = 251

| population_as_of = 2021

| population_density_km2 = 7.4

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Big Grassy River 35G is a First Nations reserve on the eastern shore of Lake of the Woods in Ontario, Canada. It is one of six parcels of land reserved for the Big Grassy First Nation.