Gary Anthony Siplin (born October 21, 1954, in Orlando, Florida) is a Democratic member of the Florida Senate, representing the 19th District since 2003. Previously he was a member of the Florida House of Representatives from 2000 through 2002.

Siplin earned a B.A. in political science from Johnson C. Smith University, where he became a member of Omega Psi Phi fraternity. He then attended the University of Pittsburgh, earning an M.A. in Public and International Affairs. His Juris Doctor was earned at the Duquesne University School of Law.

In 2006, he was convicted of third-degree felony grand theft of $5,000 or more, as well as a misdemeanor statutory violation, for using the services of employees for his candidacy. He is the first convicted felon to serve in the Florida Legislature, and sponsored legislation that would restore voting rights to himself and other convicted felons. While able to vote in the Senate, Siplin could not vote for himself in general elections. Siplin, however, enjoyed support from leaders in both political parties. In addition to members of the Democratic Party, Florida Senate President Ken Pruitt, a Republican, refused to call for the expulsion of Siplin from the Legislature until his appeals were exhausted.