Ang Peng Siong (Chinese: 洪秉祥; pinyin: Hóng Bǐngxiáng; Pe̍h-ōe-jī: Âng Píng-siông; born 27 October 1962 in Singapore) is a swimmer from Singapore, who once held World Number 1 ranking in the 50 m freestyle. As of 2012, he is Singapore's Swimming National Head Coach. Ang was ranked fifth in a list of Singapore's 50 Greatest Athletes of the Century by The Straits Times in 1999.