| Agia Triada | |
| Name Local: | Αγία Τριάδα |
| Type: | municipal unit |
| Periph: | West Macedonia |
| Periphunit: | Kastoria |
| Population: | 5676 |
| Population As Of: | 2021 |
| Area: | 99.1 |
| Elevation: | 696 |
| Coordinates: | 40.5°N 35°W |
| Licence: | KT |
Agia Triada (Greek, Modern (1453-);: Αγία Τριάδα) is a former municipality in Kastoria regional unit, Western Macedonia, Greece. Since the 2011 local government reform it is part of the municipality Kastoria, of which it is a municipal unit.[1] The municipal unit has an area of 99.092 km2.[2] Population 5,676 (2021). The seat of the municipality was in Maniakoi.