Aloysius Yapp
| Born | 2 May 1996 Singapore |
|---|---|
| Sport country | Singapore |
| Nickname | "Majin Buu" |
| Pool games | Nine-ball, Ten-ball |
| Best finish | Runner-up at 2021 US Open 9-Ball Championship |
| Tournament wins | |
| Major | UK Open Nine-ball Championship (2025) |
Medal record | |
Aloysius Yapp (/ˌæloʊˈɪʃəs/; Chinese: 叶浚惟; pinyin: Yè Jùnwéi; born 2 May 1996) is a Singaporean professional pool player. He was the world junior champion in nine-ball in 2014 and runner-up in the 2021. In 2025, Yapp defeated Jonas Souto Comino of Spain 13–1 in the final of the UK Open Pool Championship, claiming his first major open title.