Duncan James Sinclair (1 July 1867 – 17 August 1943) was a Liberal party member of the House of Commons of Canada. He was born in Brooke Township, Ontario and became a physician.

Duncan James Sinclair
Member of Parliament
for Oxford North
In office
December 1921 – October 1925
Preceded byEdward Walter Nesbitt
Succeeded byDonald Sutherland
Personal details
Born
Duncan James Sinclair

(1867-07-01)1 July 1867
Brooke Township, Ontario
Died17 August 1943(1943-08-17) (aged 76)
Political partyLiberal
ProfessionPhysician

He was elected to Parliament at the Oxford North riding in the 1921 general election. After serving his only federal term, the 14th Canadian Parliament, Sinclair was defeated in the 1925 federal election by Donald Sutherland of the Conservatives.

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