William J. Rennie

William J. Rennie (September 12, 1891 – December 10, 1964) was an American football coach. Rennie was the head football coach at Hillsdale College in Hillsdale, Michigan. He held that position for the 1920 and 1921 seasons. His coaching record at Hillsdale was 12–4–1.
On August 12, 1920, Rennie married Elizabeth Adelaide Goodrich in Hillsdale. Later regarded as an expert in fly fishing, he died in 1964 and was buried in Hillsdale.