Longa can refer to any of the following:
- The longa is a musical note twice as long in duration as a breve, appearing primarily in Early music.
- Longa, a genre in Turkish and Arabic music
- Longa is the name of a town and river in Angola.
- Longa (Greek: Λόγγα) is also a place in Messinia in Greece, in the municipality of Aipeia.
- Longa Island is an island near Gairloch in Scotland.
- Longa Stacks, small islets off the west coast of Unst, Shetland, Scotland.