| Posu Ank | |
| Office1: | Member of the National Parliament |
| Term1: | 1977–1982 |
| Predecessor1: | Momei Pangial |
| Successor1: | William Ank |
| Constituency1: | Mendi Open |
| Party: | People's Progress Party |
| Death Date: | April 1982 (aged 35) |
Posu Ank (died April 1982) was a Papua New Guinean politician. He served as a member of the National Parliament between 1977 and 1982.
A pastor in the United Church, Ank contested the Mendi Open constituency in the 1972 elections, but finished as runner-up to Momei Pangial. He served as Chairman of the Southern Highlands Area Authority.[1]
He defeated Pangial in the 1977 elections and was elected to the National Parliament.[2] 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.[3] When PPP leader Julius Chan took over as Prime Minister, Ank became government whip.[4]
He died in a car accident in 1982,[4] shortly before nominations closed for the general elections that year. His brother William stood as the PPP candidate in his place and was elected.[5] A primary school in Mendi was named after him.[6]