Cromna may refer to:
- Cromna (Arcadia), a town of ancient Arcadia, Greece
- Cromna (Corinthia), a town of ancient Corinthia, Greece
- Cromna (Paphlagonia), a town of ancient Paphlagonia, now in Turkey
- Amasra, a possible site of the Paphlagonian town
- Kurucaşile, a possible site of the Paphlagonian town
- Cromna, a genus of fulgoroid planthoppers in the family Flatidae