Colin Sinclair (born December 19, 1994) is a Northern Mariana Islander tennis player. He achieved a career best singles ranking of world No. 410 on 5 August 2019, and a career high doubles ranking of world No. 476 on 29 August 2022. He has reached 9 singles finals on the ITF Futures Tour, with a record of 2 win and 7 losses. Additionally, he has reached 4 doubles finals on the ITF Futures Tour, with a record of 2 wins and 2 losses.