Maitland Stewart McCarthy (February 5, 1872 – May 17, 1930) was a politician, lawyer and judge from western Canada. Born in Orangeville, Ontario, he was the son of Thomas Anthony Maitland McCarthy, a county court judge, and Jennie Frances Stewart. He studied at Trinity College School in Port Hope and Trinity University, receiving a LLB in 1896. He was called to the Ontario bar in 1897 and set up practice in Sarnia.