Mark Huynh (born March 22, 2002) is an American professional soccer player who plays as a left-back for Hải Phòng. 
Early life.
Huynh was born on March 22, 2002. Born in Andover, Massachusetts, United States, he is of Vietnamese descent through his parents. He attended Tufts University.
Career.
As a youth player, Huynh joined the youth academy of Seacoast United Phantoms. In 2020, he signed for Valeo FC. Two years later, he signed for Boston Street Soccer. 
Ahead of the 2024 season, he joined Irish side Athlone Town. On October 18, 2024, he debuted for the club during a 0–2 away loss to Kerry in the League of Ireland First Division. This was his only league appearance for the team. 
In 2025, he came to his parents origin country Vietnam and signed for V.League 1 club Hải Phòng. On May 9, 2025, he debuted for the club during a 2–0 away win over Ho Chi Minh City in the 2024–25 V.League 1.
Style of play.
Huynh operates mainly as a left-back, but can also play as a left winger.