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. 103 achieved on 4 March 2024. He also has a career high singles ranking of No. 439 achieved on 22 November 2021. He has won four doubles ATP Challenger titles.

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.

He also received a wildcard for the 2024 US Open partnering Christian Harrison.

Result	W–L	Date	Tournament	Tier	Surface	Partner	Opponents	Score
Win	1–0	Jul 2023	Santa Fe, Argentina	Challenger	Clay	Matías Soto	Ignacio Carou Ignacio Monzón	7–6(7–3), 6–2
Win	2–0	Jul 2023	Salinas, Ecuador	Challenger	Clay	Alfredo Perez	Ángel Díaz Jalil Álvaro Guillén Meza	7–5, 7–5
Loss	2–1	Jul 2023	Lexington, USA	Challenger	Hard	George Goldhoff	Eliot Spizzirri Tyler Zink	6–4, 3–6, [8–10]
Loss	2–2	Oct 2023	Fairfield, US	Challenger	Hard	Denis Kudla	Evan King Reese Stalder	5–7, 3–6
Win	3–2	Jan 2024	Tenerife, Spain	Challenger	Hard	Luis David Martínez	Karol Drzewiecki Piotr Matuszewski	3–6, 6–4, [10–3]
Loss	3–3	Feb 2024	Bahrain Ministry of Interior Tennis Challenger, Bahrain	Challenger	Hard	Patrik Niklas-Salminen	Petros Tsitsipas Sergio Martos Gornes	6–3, 3–6, [8–10]
Loss	3–4	Nov 2024	Seoul Open Challenger, Korea	Challenger	Hard	Bart Stevens	Saketh Myneni Ramkumar Ramanathan	4–6, 6–4, [3–10]
Win	4–4	Nov 2024	2024 Kobe Challenger, Japan	Challenger	Hard (i)	Bart Stevens	Kaichi Uchida Takeru Yuzuki	7-6(9-7), 7-5

• Vasil Kirkov at the Association of Tennis Professionals
• Vasil Kirkov at the International Tennis Federation