| James Maclennan | |
| Office1: | Puisne Justice of the Supreme Court of Canada |
| Predecessor1: | Wallace Nesbitt |
| Successor1: | Francis Alexander Anglin |
| Term Start1: | October 5, 1905 |
| Term End1: | February 13, 1909 |
| Nominator1: | Wilfrid Laurier |
| Constituency Mp2: | Victoria North |
| Parliament2: | Canadian |
| Predecessor2: | Joseph Staples |
| Successor2: | Hector Cameron |
| Term Start2: | 1874 |
| Term End2: | 1875 |
| Birth Date: | 17 March 1833 |
| Birth Place: | Lancaster, Upper Canada |
| Death Place: | Toronto, Ontario |
| Party: | Liberal |
| Alma Mater: | Queen's University |
| Profession: | Lawyer |
| Honorific Prefix: | The Honourable |
James Maclennan (March 17, 1833 - June 9, 1915) was a Canadian lawyer, politician, and Puisne judge of the Supreme Court of Canada.
Born in the township of Lancaster, Upper Canada (now Ontario), the son of Roderick Maclennan and Mary Macpherson, he received a Bachelor of Arts from Queen's University in 1849. He studied to be a lawyer and was called to the bar in 1857. He practised law with Oliver Mowat in Toronto until 1888, when he was appointed to the Ontario Court of Appeal. He was the editor of The Ontario Judicature Act, 1881 (1884)[1]
Maclennan ran unsuccessfully for a seat in the Ontario assembly in 1871.[2] In the 1874 federal election, he was elected to the House of Commons of Canada in the riding of Victoria North. However, the election was declared void. He won the by-election in 1874 but again the election was declared void. In 1905, he was appointed to the Supreme Court of Canada and retired in 1909.[3]
Maclennan was married twice: to Elizabeth McGill in 1862 and to Mary L. Strange in 1909,[2] possibly children, but none surviving him.[4]