| Type: | commune |
| County: | Bacău |
| Population Total: | auto |
| Official Name: | Cleja |
| Leader Name: | Petru Iștoc[1] |
| Leader Party: | PNL |
| Term: | 2020 - 2024 |
| Coordinates: | 46.4°N 81°W |
Cleja (hu|Klézse) is a commune in Bacău County, Western Moldavia, Romania. It is composed of three villages: Cleja, Somușca (Somoska) and Valea Mică (Pokolpatak).
In 2011, the commune had a population of 6621: 94.41% ethnic Romanians, 2.43% Hungarians and Csangos. At the 2002 census, 97.8% of residents were Roman Catholic, 1.6% Romanian Orthodox and 0.2% Pentecostal.