Pavel Mikalayevich Lahun (Belarusian: Павел Мікалаевіч Лагун; born 12 February 1979) is a Belarusian former swimmer, who specialized in freestyle and butterfly events. He is a two-time Olympian (2000 and 2004), and a three-time medalist at the FINA World Cup. Lagoun made his first Belarusian team at the 2000 Summer Olympics in Sydney, where he placed tenth in the 4×100 m freestyle (3:20.85), and twelfth in the 4×200 m freestyle (7:24.83), as a member of the Belarusian swimming team.