Look up olm in Wiktionary, the free dictionary.

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

Olm may also refer to:

• Ocular larva migrans, an eye disease
• Oil life monitor
• Olm (and Megolm) is a cryptographic algorithm used by Matrix (protocol)
• Olm, Luxembourg
• OLM, Inc., 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
• Congregation of the Sisters of Our Lady of Mercy