| Birth Date: | 1977 11, df=yes |
| Birth Place: | Cook Islands |
| Height: | 1.8 m |
| Weight: | 83 kg |
| Ru Position: | Fullback, Wing |
| Ru Provinceyears1: | 2004-06, 2008 |
| Ru Province1: | Counties Manukau |
| Ru Provinceapps1: | 28[1] |
| Ru Provincepoints1: | 92 |
Koiatu Koiatu (born Cook Islands, 26 November 1977) is a Cook Islands rugby union footballer. He plays as a fullback and as wing.
Koiatu currently plays for Bombay and for Counties Manukau, in New Zealand. He is an international player for Cook Islands, both at XV and Sevens. He played at the IRB Sevens World Series, in 2006 and 2008.
Koiatu now lives in Perth Western Australia where he plays and coaches at Wanneroo Districts Rugby Union Club, historically and currently Perth's premier club.