Catherine Au Yeung Wai-sum (Chinese: 歐陽慧心; Jyutping: au1 joeng4 wai3 sam1; born 16 October 1984) is a sabre fencer from Hong Kong, China.

[1] She won a silver medal in the 2010 Pattaya City World Cup.

In the 2011 Summer Universiade she reached the semifinals after defeating Romania's Mihaela Bulică, then lost to another Romanian, Bianca Pascu, and came away with a bronze medal.

[3] Au Yeung graduated in marketing from Hong Kong Polytechnic University.

[1] This biographical article related to fencing in Hong Kong is a stub.