Frank David Guernsey Jr. (January 19, 1917 – March 20, 2008) was an American tennis player. He was a finalist at the 1946 US Open in the Men's Doubles where along with Don McNeill he lost 3–6, 6–4, 2–6, 6–3, 20–18 to William Talbert and Gardnar Mulloy. Frank Guernsey was born on 19 January 1917, in Orlando, Florida, to Frank Drummond Guernsey and Anita McChesney Guernsey. In 1989 he was inducted into the Men's Collegiate Tennis Hall of Fame.