Buvik is a former municipality in Sør-Trøndelag county, Norway. The administrative centre was located in the village of Buvika. Buvik encompasses the extreme northeastern part of the present-day municipality of Skaun. It encompassed the area surrounding the Vigda river south of the Gaulosen fjord.
The municipality was established in 1855 when it split off from the old municipality of Byneset. Initially, Buvik had a population of 841. On 1 January 1964, the Langørgen farm area (population: 11) was merged into the neighboring municipality of Melhus. On 1 January 1965, the rest of Buvik (population: 1,267) was merged together with Børsa and Skaun to form a new, larger municipality of Skaun.