Sydney John Smith, PC (September 23, 1892 - July 15, 1976), was a Canadian politician, farmer, rancher and businessman who served as Speaker of the Senate of Canada from 1966 to 1968.

He studied at New York University through correspondence courses and played football with the Regina Roughriders as well as working as an automobile salesman.

He then moved to Kamloops, British Columbia where he raised cattle and grew hops as well as involving himself in selling automobile sales and heavy equipment.

Smith entered British Columbia politics in the 1949 provincial election and was elected as MLA for the Kamloops riding for the British Columbia Liberal Party (then in a coalition with the Conservative Party) but was defeated after one term with much of the rest of the Coalition caucus (his successor in the Kamloops seat was Phil Gaglardi, who would become a member of the new Social Credit cabinet).

He served as president of the British Columbia Liberal Association from 1953 to 1959 and was summoned to the Senate on January 3, 1957, on the advice of Prime Minister Louis St. Laurent.