Welson Sim

Welson Sim Wee Sheng (born 29 March 1997) is a Malaysian professional swimmer. He was the first Malaysian male swimmer to qualify for the men's 400 metre freestyle event at the 2016 Summer Olympics.

Early and personal life
Sim was born in Kuching, Sarawak to Lee Ngiat Kim and Sim Ah Tee. He started joining swimming classes at the age of 10 to overcome childhood asthma, and competed in Sarawak's President Cup a year later. By the time he turned 12, he was in the Sarawak state swimming team. Sim attended Batu Lintang National Secondary School, before transferring to Bukit Jalil Sports School during the mid-semester in Form Three.

In March 2021, Sim involved in a motorcycle accident, resulting in a broken arm and had two pins inserted into his left arm.