Dan Cassidy (born April 29, 1961) is a former professional tennis player from the United States. He was born in Hollywood, Florida.
During his career, Cassidy won 1 singles title. He achieved a career-high singles ranking of world No. 74 in 1985 and a career-high doubles ranking of World No. 62 in 1986.
Grand Prix finals
Singles (1 win)
| Result | W-L | Date | Tournament | Surface | Opponent | Score |
|---|---|---|---|---|---|---|
| Win | 1–0 | Dec 1984 | Melbourne Outdoor, Australia | Grass |  John Fitzgerald
|
7–6, 7–6 |
Doubles (1 loss)
| Result | W-L | Date | Tournament | Surface | Partner | Opponents | Score |
|---|---|---|---|---|---|---|---|
| Loss | 0–1 | Jul 1986 | Boston, U.S. | Clay |  Mel Purcell
|
 Hans Gildemeister  Andrés Gómez
|
6–4, 5–7, 0–6 |
