Robert Smith (7 December 1858 – 18 March 1942) was a Canadian lawyer, politician and puisne justice of the Supreme Court of Canada. Born in Lanark County, Canada West (now Ontario), the son of William Smith and Jean Neilson, he was educated in Almonte and at Osgoode Hall. He was called to the Ontario Bar in 1885. He then practiced law in Cornwall, Ontario. In 1888, Smith married Florence Parker Pettit. In 1904, he ran for the House of Commons of Canada as a Liberal in the riding of Stormont, Ontario. He lost but won in 1908. He did not run for re-election. Smith died in Ottawa at the age of 83.