Frank Russell Dancevic (born September 26, 1984) is a professional touring and Canadian Davis Cup tennis player. He has been the country's top singles player since January 30, 2006.

The right-handed Dancevic turned pro in 2003 and reached his career high singles ranking in September 2007 at World No. 65. A native of Niagara Falls, Ontario, he is the highest ranked men's Canadian singles player since Daniel Nestor, who was ranked World No. 61 in September 1999. (The highest ranking ever achieved by a Canadian is World No. 41, by Greg Rusedski in June 1994.) It was Fred Niemeyer that Dancevic overtook to become the top-ranked Canadian singles player.

Dancevic's career record in singles in ATP (World) Tour events (International Series or higher) and Davis Cup (at all levels) is 41-64 to date. His best tournament results to date has been reaching the final of the 2007 Indianapolis Tennis Championships, winning the 2003 Granby and Lexington, 2006 Waikoloa and Granby, and 2008 Surbiton Challenger Series events, and reaching the semi-finals of the 2008 Campbell's Hall of Fame Championships.