Marihatag, officially the Municipality of Marihatag (Surigaonon: Lungsod nan Marihatag; ); (Indonesian: Kotamadya Marihatag) , is a municipality in the province of Surigao del Sur, Philippines. According to the 2020 census, it has a population of 19,441 people.
It was known as Oteiza until 1955.
The municipality hosts the "Balik-Marihatag" Festival which literally means going back home to Marihatag.
Its name is a concatenation of Maria Ihatag.
Marihatag is politically subdivided into 12 barangays. Each barangay consists of puroks while some have sitios.
Marihatag has a tropical rainforest climate (Af) with heavy to very heavy rainfall year-round and with extremely heavy rainfall in January.