| Province: | Ontario |
| Fed-Status: | defunct |
| Fed-Created: | 1914 |
| Fed-Abolished: | 1966 |
| Fed-Election-First: | 1917 |
| Fed-Election-Last: | 1965 |
Lanark was a federal electoral district represented in the House of Commons of Canada from 1917 to 1968. It was located in the province of Ontario. This riding was first created in 1914 from Lanark North and Lanark South ridings.
It consisted of the county of Lanark.
The electoral district was abolished in 1966 when it was redistributed between Frontenac—Lennox and Addington and Lanark and Renfrew ridings.
This riding elected the following members of the House of Commons of Canada:
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On Mr. Hanna's death, 27 February 1918:|}
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On Mr. Stewart's death, 7 October 1922: |}
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On Mr. Preston's death, 8 February 1929: |}
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On Mr. Blair's death, 16 June 1957: |}
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