John Howard Sinclair (May 27, 1848 – June 8, 1924) was a Canadian politician.

Born in Goshen, Guysborough, Nova Scotia, Sinclair was educated in the Common School of Goshen, Guysborough Academy and Dalhousie College, Halifax. A lawyer, he was Mayor of New Glasgow in 1890-91 and member of the Nova Scotia House of Assembly from 1894 to 1904. He was elected to the House of Commons of Canada for Guysborough in a 1904 by-election after the sitting MP, Duncan Cameron Fraser, was appointed a Judge of the Nova Scotia Supreme Court. A Liberal, he was re-elected in 1904, 1908, 1911, and 1917.

• The Canadian Parliament; biographical sketches and photo-engravures of the senators and members of the House of Commons of Canada. Being the tenth Parliament, elected November 3, 1904

• John Howard Sinclair – Parliament of Canada biography

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