Otterfing (German pronunciation: [ˈɔtɐfɪŋ]) is a municipality in the district of Miesbach in Bavaria in Germany.

Otterfing lies on end moraine hills of the last Ice Age in the foothills of the Alps overlooking the Mangfall Mountains. The village Otterfing is located in the middle of Upper Bavaria on the Bundesstraße 13 only 4 km north of Holzkirchen directly on the southern border of the administrative district Munich. In the north, the Hofoldinger Forest borders the municipal area. After the dissolution of this forest area as a community-free area, parts of it were added to Otterfing on 1 January 2011.

The state capital Munich is 30 km away, the district town Miesbach 23 km, Wolfratshausen 21 km, Bad Tölz 22 km and Rosenheim 37 km.

Besides Otterfing itself there are five districts:

Sauerlach, Aying (both districts Munich), Holzkirchen (district Miesbach) and Dietramszell (district Bad Tölz-Wolfratshausen).

Archaeological finds prove the settlement already in the Celtic period. In 1942, during excavation work near the station, the grave of a woman from the late Roman period (ca. 350 to 355 AD) was discovered. Among other burial objects, a coin from the reign of Constantius II. was recovered from a depth of 1.30 metres.

Otterfing was first mentioned in a document in 1003 in a traditional book of the Tegernsee monastery as "Otolvinga". After many different spellings the place is already called Otterfing in 1568 in the Bavarian country tables of Philipp Apian.

Otterfing has been an independent political community since the administrative reforms in Bavaria in 1818.