Overhalla is a municipality in Nord-Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is the village of Ranemsletta (also called Overhalla). Other villages include Melen, Skage, Skogmo, Svalia, and Øysletta.

The population is concentrated in the relatively broad Namsen river valley at the center. Public services, agriculture, and tourism are the main sources of income. Overhallahus (a house building company) and Pharmaq (a fish vaccine factory) are located in the municipality.

The municipality of Overhalla was established on 1 January 1838 (see formannskapsdistrikt). On 1 January 1964, the Galguften and Hauknes area (population: 15) of Høylandet was transferred to Overhalla.

The Old Norse form of the name was œfri halfa which means "the upper half (of Namdalen)". Historically, the Namdalen district was divided in two parts: "the upper half" and "the lower half". The municipality of Overhalla today is, however, just a fraction of the old part of œfri halfa.

The coat-of-arms is from 1989, but is inspired by an old seal for the district by King Håkon Magnusson from 1344. It shows seven red greek crosses arranged in a circle on a gold background.

The Church of Norway has two parishes (sokn) within the municipality of Overhalla. It is part of the Namdal deanery in the Diocese of Nidaros.

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