Montross Phansovannarun

 (Khmer: មនត្រស ផានសុវណ្ណអារុន) is a Cambodian swimmer. He mostly competed in 50m, 100m, and 200m swimming competitions and currently holds the national record of 26.70 in the 50m butterfly at the SEA Games.

Careers
He made his debut at the 2019 FINA World Junior Swimming Championships in Men 50m Freestyle when he was 16 years old. He also competed at the 2021 FINA World Swimming Championships (25 m). He won a bronze medal in Men 50m Freestyle at Thailand National Championships (25m course). He participated in the 2021 SEA Games in Vietnam and the 2023 SEA Games in Cambodia, which he is also an athlete's oath.

He represented Cambodia at the 2023 World Aquatics Championships in the 50 metre freestyle event and 50 metre butterfly event.

Personal life
He was born to an American dad, who is a businessman in Cambodia, and a Cambodian mom.