| Coordinates: | 53.8833°N 57°W |
| Image Plan: | Altkalen_in_LRO.svg |
| State: | Mecklenburg-Vorpommern |
| District: | Rostock |
| Amt: | Gnoien |
| Elevation: | 37 |
| Area: | 45.54 |
| Postal Code: | 17179 |
| Area Code: | 039971 |
| Licence: | LRO |
| Gemeindeschlüssel: | 13 0 72 004 |
| Mayor: | Renate Awe |
| Bürgermeistertitel: | Bürgermeisterin |
Altkalen is a municipality in the Rostock district, in Mecklenburg-Vorpommern, Germany.
Kalen was first mentioned in a document from 1174. The name "Kalen" is of Slavic origin and means "marsh" or "morass". After 1236, Kalen was expanded as a city with a strong fortification.