Tammy Lau Nga-wun (born 30 July 1992) is a Hong Kong rugby union player.

In 2016, Lau was named Women's Premiership Player of the Year by the Hong Kong Rugby Union at their annual end-of-season awards night.

[4][5] Later in November, she was selected in Hong Kong's training squad as they prepared for the World Cup qualifiers against Fiji and Japan.

[6] She was part of Hong Kong's historic side that debuted at the 2017 Women's Rugby World Cup in Dublin.

[12][13] She was in the starting line-up that faced Japan in the opening match of the 2024 Asia Rugby Women's Championship.