Ang Ui-jin (Chinese: 洪惟仁; Pe̍h-ōe-jī: Âng Ûi-jîn; pinyin: Hóng Wéirén; born 16 June 1946) is a Taiwanese linguist.
He was persecuted during the White Terror and sentenced to life imprisonment for "crimes of rebellion" (預備叛亂罪) in 1973.
He then obtained his Ph.D. from the Language Research Institute of National Tsing Hua University.
His research expertises include Min Nan phonetics, dialectology, Chinese phonology, and the sociology of language.
He became dean and full-time professor at the Department of Taiwanese Languages and Literature at National Taichung University in 2006.