| Type: | Stadt |
| Image Coa: | Wappen Friesack.png |
| Coordinates: | 52.7333°N 47°W |
| Image Plan: | Friesack in HVL.png |
| State: | Brandenburg |
| District: | Havelland |
| Amt: | Friesack |
| Elevation: | 35 |
| Area: | 83.67 |
| Postal Code: | 14662 |
| Area Code: | 033235 |
| Licence: | HVL |
| Gemeindeschlüssel: | 12 0 63 088 |
| Divisions: | 2 Ortsteile |
| Website: | www.amt-friesack.de |
| Mayor: | Lothar Schneider[1] |
| Leader Term: | 2024 - 29 |
| Party: | SPD |
Friesack (pronounced as /de/; also Friesack/Mark) is a town in the Havelland district, in Brandenburg, in north-eastern Germany. It is situated 22km (14miles) northeast of Rathenow, and 25km (16miles) southwest of Neuruppin. It is known for its Mesolithic archaeological site.
During World War II, in September 1943, the Oflag 8 prisoner-of-war camp was relocated from Frauenberg to Wutzetz, present-day district of Friesack.[2] Polish, Greek, Bulgarian and Romanian officers were held in the camp before its dissolution in April 1945.[2]