Vasil Kirkov (born 13 March 1999) is a Bulgarian-born American professional tennis player.

Kirkov has a career high ATP doubles ranking of world No.

Kirkov made his Grand Slam main draw debut at the 2017 US Open after receiving a wildcard for winning the under-18 boys championship with Danny Thomas.

He reached the third round at the 2023 US Open after receiving a wildcard partnering Denis Kudla.

He entered the ATP 500 2024 Mubadala Citi DC Open in Washington as a lucky loser partnering Evan King.