St. Leonhard in Passeier (German pronunciation: [saŋkt ˈleːɔnhard ʔɪn paˈsaɪɐ]; Italian: San Leonardo in Passiria [san leoˈnardo im pasˈsiːrja]) is a comune (municipality) and a village 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).

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

It is the sign of the Lords of Passeier who lived in Jaufenburg Castle in the 13th and 14th centuries.

[4] According to the 2024 census, 98.99% of the population speak German, 0.69% Italian and 0.33% Ladin as first language.