Orsa or ORSA may refer to:
Orsha or Orša, Belarus
Orsa Municipality, Swedish municipality
Orsa-class torpedo boat, built for the Italian Navy in the 1930s
Italian training ship Orsa Maggiore (A5323), a contemporary ocean ketch serving as a sail training vessel
Orsa (moth), a noctuid moth
Operations Research Society of America
Own Risk and Solvency Assessment, in EU insurance regulation
Oxacillin-resistant Staphylococcus aureus
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