Omo or OMO may refer to:
- Omo remains, a collection of hominid bones
- Omo River in southern Ethiopia
- Omo Island, Denmark
- Omo National Park, in Ethiopia
- Open market operations, by the Federal Reserve or other central banks
- Omo (detergent), a detergent product
- Omo, means child in the Yoruba language
- Omo, means "oh my gosh" in the Korean language