Posu Ank (died April 1982) was a Papua New Guinean politician.
A pastor in the United Church,[1] Ank contested the Mendi Open constituency in the 1972 elections, but finished as runner-up to Momei Pangial.
[3] A member of the People's Progress Party, following the elections, he was appointed Secretary to the Minister for Health as the PPP joined the coalition government.
[4] When PPP leader Julius Chan took over as prime minister, Ank became government whip.
[5] He died in a car accident in 1982,[5] shortly before nominations closed for the general elections that year.