Quinn Vandecasteele (born September 1, 2002) is an American tennis player. Vandecasteele has a career high ATP singles ranking of No. 461 achieved on March 30, 2026 and a career high ATP doubles ranking of No. 578 achieved on November 10, 2025.
Vandecasteele has won one ATP Challenger doubles title at the 2025 Knoxville Challenger.
Vandecasteele played college tennis at Oregon.