William Joseph Posey is an American businessman and politician serving as the U.S. representative for Florida's 8th congressional district, in Congress since 2009. A member of the Republican Party, he formerly served in the Florida Senate and the Florida House of Representatives.

Florida's 8th congressional district is an electoral district for the U.S. Congress and was reassigned in 2012, effective January 2013, from the inland central part of Florida to the central Atlantic coast. The district includes Titusville, Melbourne, Cocoa, and Cape Canaveral, Florida. The district includes all of Brevard County, as well as all of Indian River County and parts of Orange County. The district also includes the Kennedy Space Center.