St. Leonhard is a comune (municipality) in the Passeier Valley in South Tyrol, northern Italy, located about 35 kilometres (22 mi) north of Bolzano.

As of 30 November 2010, it had a population of 3,547 and an area of 88.4 square kilometres (34.1 sq mi).

Its bordering municipalities are Moos in Passeier, Ratschings, Riffian, St Martin in Passeier, Sarntal, and Schenna.

The municipality of St. Leonhard in Passeier contains the frazioni (subdivisions, mainly villages and hamlets) Walten (Valtina) and Schweinsteg (Sant'Orsola).