Mark Adam Foley (born September 8, 1954) is an American politician who served as a Republican member of the United States House of Representatives from 1995 until 2006, representing the 16th District of Florida.

Foley resigned from Congress on September 29, 2006, after allegations surfaced that he had sent suggestive emails and sexually explicit instant messages to teenaged males who had formerly served and were at that time serving as Congressional pages. As a result of the disclosures, the Federal Bureau of Investigation (FBI) and the Florida Department of Law Enforcement opened investigations of the messages to find possible criminal charges. The House Ethics Committee has also opened an investigation into the response of the House Republican leadership and their staff to earlier warnings of Foley's conduct.

Foley was elected to the U.S. House in 1994 with 58 percent of the vote, defeating Democrat John Comerford. He was re-elected in 1996 with 64 percent of the vote against Democrat Jim Stuber, and again in 1998 (this time without opposition). He was re-elected in 2000 with 60 percent of the vote against Democrat Jean Elliott Brown and Reform Party candidate John McGuire. Constitution Party candidate Jack McLain was his only opponent in 2002. He was re-elected in 2002 with 79 percent of the vote and in 2004 with 68 percent of the vote.