Gustaf "Guus" Hendrik Mantik (26 April 1928 – 8 August 2001) was an Indonesian military officer, governor, and parliamentarian.

Mantik began his military career in 1946 as part the "Loyalty of the Indonesian People from Sulawesi" (or Kebaktian Rakjat Indonesia Sulawesi (KRIS)) during the Indonesian National Revolution.

[2] He was appointed Governor of North Sulawesi in 1980 and held the office until 1985.

[3] After the death of Sunandar Prijosudarmo, Mantik assumed Sunandar's role as Deputy Chairman of the People's Consultative Assembly (or Majelis Permusyawaratan Rakyat (MPR)) until 1987.

[4] Mantik died on 8 August 2001 and was buried in the Kalibata Heroes' Cemetery in Jakarta.