Omnia may refer to:
- Omnia (band), a pagan folk band from the Netherlands
- Omnia (musician), a Ukrainian trance/progressive house dj and producer
- Omnia Township, Cowley County, Kansas
- Omnia, a fictional nation in the Discworld universe
- Omnia, a fictional realm in the Sudeki universe
- Samsung Omnia, a group of smartphones by Samsung
- Samsung Omnia II
- Samsung Omnia HD
- Samsung Omnia 7