Paea Okalani Fa'anunu (born 4 November 1988) is a Tongan rugby union player. He plays in the prop position for the France based Top 14 side, Castres. Fa'anunu also represents Tonga at international level. Fa'anunu played for Canterbury in the ITM Cup. His performances at domestic level had seen him named in the Crusaders wider training squad for the 2013 Super Rugby season. He made his international debut against Italy on 8 November 2014.