Duncan Campbell Ross

{{Short description|Canadian politician}}

{{Use Canadian English|date=September 2021}}

{{Use dmy dates|date=September 2021}}

{{Infobox officeholder

| name = Duncan Campbell Ross

| image =

| imagesize =

| riding = Middlesex West

| parliament = Canadian

| term_start = 1909

| term_end = 1921

| predecessor = William Samuel Calvert

| successor = John Douglas Fraser Drummond

| office2 = Ontario MPP

| term_start2 = 1908

| term_end2 = 1909

| predecessor2 = Charles Constantine Hodgins

| successor2 = James William Doyle

| constituency2 = Middlesex North

| term_start3 = 1907

| term_end3 = 1908

| predecessor3 = George William Ross

| successor3 = John Campbell Elliott

| constituency3 = Middlesex West

| party = Liberal

| otherparty = Ontario Liberal Party

| birth_date = {{birth date|df=yes|1871|12|16}}

| birth_place = Strathroy, Ontario, Canada

| death_date = {{death date and age|df=yes|1961|01|10|1871|12|16}}

| death_place =

| nationality =

| spouse =

| relations = George William Ross, father

| children =

| occupation =

}}

Duncan Campbell Ross (16 December 1871 – 10 January 1961) was a Canadian lawyer and Liberal politician. He sat in the Legislative Assembly of Ontario representing Middlesex West from 1907 to 1908 and Middlesex North from 1908 to 1909.

He represented Middlesex West in the House of Commons from 1909 to 1921. During the Conscription Crisis of 1917, Ross remained loyal to the anti-conscription (and largely francophone) Laurier Liberals, and was one of only 8 members of the faction to be elected from Ontario in that year's election.

He is the son of Sir George William Ross who was Premier of Ontario from 1899 to 1905.{{fact|date=November 2024}}