Harg Church (Swedish: Hargs kyrka) is a medieval church in Stockholm County, Sweden. It is part of the Archdiocese of Uppsala (Church of Sweden).

Although built in the 15th century, the church derives its present appearance from a major reconstruction which was carried out in the 18th century. The tower also is not medieval; it dates from 1781 and replaced an earlier church porch. Inside, the church still contains frescos from the 1514, including a large fresco depicting the archangel Michael and the unusual Saint Kakwkylla. The oldest item in the church is the 14th century triumphal cross; most other furnishings date from the 18th century.

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60°11′14″N 18°23′29″E / 60.18722°N 18.39139°E / 60.18722; 18.39139