Sinali Latu (born in Tonga in 1965) is a retired Tongan-Japanese rugby union player. He played in Japan for Sanyo and also played for the Japan national rugby union team. Now he coaches the Daito Bunka University rugby team. Since he acquired the Japanese citizenship, he changed his full name to William Sinali Latu (ラトゥ ウィリアム志南利, Ratu Uiriamu Shinari). He is the founder of the non-profit organisation Japan-Tonga Friendship Association. He was nicknamed "Bill" (ビル) during his playing career in Japan.