Sairusi Naituku (26 February 1961 in Lomaiviti – 7 June 2016 in Lautoka) was a Fijian rugby union player.
He played as a prop He was the captain of Fiji secondary school and Fiji Colts and was one of the first Fijians to secure a rugby contract in South Africa, playing for the South Pacific Barbarians, a team made up of players from Fiji, Samoa and Tonga that went to play a rebel tour in the apartheid-era South Africa.
He was educated first, at Annesly Infant School, and then, at Draiba Fijian School days, where he met fellow Fijian internationals such as Tomasi Cama, Paulo Nawalu, Elia Rokowailoa, Koli Rakoroi and Epeli Rakai.
He also was part of the 1987 Rugby World Cup Fiji squad, coached by Jo Sovau and George Simpkin, in the tournament he played 3 matches.
After retiring from his player career, Naituku coached the Natabua High School Boys Section team, who won the Coca-Cola Games in 2015.