Terengganu Integrity & Strategic Studies Institute (T-ISSI) now as known as Terengganu Strategic & Integrity Institute (TSIS) is a government link company under the Terengganu State Government. TSIS is a corporate body that incorporates of two previous agencies; Institut Integriti Negeri Terengganu (IINT) and Terengganu Development Institute (TDI).
TSIS has been in operations since 1 January 2011 and has been incorporated on 20 February 2011 under the Companies Act 1965. Previously, TSIS operated at Kem Telaga Batin, Seberang Takir, near Sultan Mahmud Airport.
TSIS was formerly known as T-ISSI and was rebranded in 2014. The current location of TSIS office is located at Jalan Kemajuan, next to Cosmopoint. The outcome of TSIS renewal process has established it to become an integrous think tank that assists and supports the Terengganu State Government with transparency and realibility.