| Birth Date: | 1973 7, df=yes |
| Birth Place: | Wellington, New Zealand |
| Weight: | 107kg (236lb) |
| Ru Position: | No. 8 |
| Ru Amateuryears: | 1994–1997 |
| Ru Amateurclubs: | Marist St Pats |
| Ru Nationalyears: | 1996-2006 |
| Ru Nationalcaps: | 13 |
| Ru Nationalpoints: | (10) |
| Ru Clubyears: | 1995-1996 1997-2000 2000-2001 2001-2003 2003-2008 |
| Ru Proclubs: | Melrose London Irish Rotherham Leeds Tykes Bath |
| Super14: | Crusaders |
| Super14years: | 1997 |
| Super14caps: | 2 |
| Super14points: | (0) |
| Ru Province: | Wellington |
| Ru Provinceyears: | 1994–1997 |
| Ru Provincecaps: | 22 |
| Ru Coachclubs: | Bishop Vesey's Grammar School |
| Ru Coachyears: | 2008-2014 |
Isaac "Zak" Fe'aunati (born 23 July 1973) is a Samoan former rugby union player. He played as a number eight.
Fe'aunati was born in Wellington, New Zealand. In September 1995 he joined Melrose,[1] debuting for the club in their 31–3 home victory over Hawick on 13 September 1995.[2]
He retired from professional rugby in 2008 to take up a coaching position at Bishop Vesey's Grammar School on 2 June 2008.[3] [4] He also played Jonah Lomu in the 2009 film Invictus.[5] In July 2014, Fe'aunati stepped down from his position at Bishop Vesey's Grammar School to return with his family to New Zealand.