I Wayan Koster (Balinese: ᬳᬶᬯᬬᬦ᭄‌ᬓᭀᬲ᭄ᬢᭂᬃ‌‌; born 20 October 1962) is an Indonesian politician who is the 10th governor of Bali. Before becoming governor, he was a member of the People's Representative Council representing the province.