Joan Sisiati Tahafa Viliamu (22 March 1966[1] – 25 November 2022[2]) was a Niuean politician and Cabinet minister.
Viliamu was born in Tuapa and educated at Matalave Primary School and Niue High School Intermediate.
[1] She worked as a public servant and businesswoman[1] before being elected to the Niue Assembly on the common roll at the 2011 election.
[3] Following the election she was appointed to Cabinet as Minister of Health, the Community Sector, and Minister for the Niue Broadcasting Corporation.
[4][5] She was re-elected in the 2014 Niuean general election but downgraded to an Assistant Minister.