The olm (Proteus anguinus) is a species of amphibian.

Olm may also refer to:

• Ocular larva migrans, an eye disease

• Oil life monitor

• Olm (encryption protocol)

• Olm, Luxembourg

• OLM (studio), formerly Oriental Light and Magic, a Japanese animation studio

• Hans Werner Olm, German comedy artist

• The Olms, a musical group made up of Pete Yorn and J.D. King

• Olympia Regional Airport (IATA code)

• Ordre Libanais Maronite, the Lebanese Maronite Order, religious order

• Ordo Lectionum Missae, a Roman Catholic liturgical lectionary