Petrus Tun (19 March 1936 – 23 March 1999) was a Micronesian politician, who played an important role during first days of Micronesian independence and previously Trust Territory times.Tun served as the first Vice President of the Federated States of Micronesia during first term of President Tosiwo Nakayama (1979-1983).Previously, he served as a Governor of Yap and a senator during the Trust Territory times.