Frederick W. Thiele Jr. (born August 8, 1953) is an American politician who serves in the New York State Assembly from the 1st district since 2013 and the 2nd district from 1992 to 2012, as a member of multiple political parties. Thiele was originally elected as a member of the Republican Party, but switched to the Independence Party of New York in 2009. He joined the Democratic Party after the Independence Party lost its ballot position.