Sidney Johnston Catts was an American politician, businessman, and anti-Catholic activist. He served as the 22nd governor of Florida from 1917 to 1921 as a member of the Prohibition Party, despite being a Democrat for most of his career. He became involved in criminal procedures due to his activities as governor and for business activities. Although he was later acquitted, he went bankrupt in the process.

The Prohibition Party is a political party in the United States known for its historic opposition to the sale or consumption of alcoholic beverages and as an integral part of the temperance movement. It is the oldest existing third party in the United States and the third-longest active party.