Ronald Jason Klein (/ˈklaɪn/ KLYNE; born July 10, 1957) is an American politician and lawyer who is a former member of the United States House of Representatives for Florida's 22nd congressional district.

In 1992, Klein defeated ten-year incumbent Steve Press in the Democratic primary to win a seat in the Florida House of Representatives.

Klein ran for a seat in the U.S. House of Representatives in Florida's 22nd congressional district against 13-term Republican incumbent Clay Shaw.

Klein was aided by voter discontent over the war in Iraq and the scandal involving Republican Congressman Mark Foley in the neighboring district.

On December 18, 2007, the magazine Politico named Ron Klein as its "Rookie of the Year", citing his willingness to cross party lines and his ability to get major legislation passed.

According to Politico, "Klein's background as a corporate lawyer and former state and federal lawmaker means he'll be selling his ability to provide legal, political, policy and business advice to prospective clients.