- Band Name: FTIsland
- Also known as: Five Treasure Island, FTI
- Origin: South Korea
- Genre: Pop Rock, Pop, R&B, Rock Ballad, Indie Rock
- Years active: 2007–present
- Band Members:
F.T. Island (Korean: 에프티 아일랜드), Five Treasure Island, or FTI, is a five-member South Korean band. The members are Choi Jong Hoon (Leader, guitar and keyboard), Lee Hong Ki (lead vocals), Lee Jae Jin (bass and vocals), Song Seung Hyun (guitar and vocals), and Choi Min Hwan (drums). Their debut album, titled "Cheerful Sensibility", was the sixth best-selling album in 2007. Their debut song 'Lovesick' stayed on top of K-Pop charts for 8 consecutive weeks.Oh Won Bin had been a member of the band up until the beginning of 2009.