Liavaʻa is a Tongan surname. Notable people with this surname include:
Alamoni Liavaʻa (born circa 1959), Tongan former rugby union player Josh Liava'a (1948-2014), former New Zealand rugby league player Taliaʻuli Liavaʻa (born circa 1950), Tongan former rugby union player Talite Liavaʻa (born 1971), Tongan former rugby league player