| Birseck Castle | |
| Native Name: | Ruine or Schloss Birseck |
| Built: | 1243/44 |
| Type: | hill castle |
| Condition: | ruin |
| Location: | Arlesheim |
| Occupants: | counts |
| Coordinates: | 47.4919°N 7.6286°W |
| Map Type: | Canton of Basel-Land#Switzerland |
| Code: | CH-BL |
Birseck Castle (German: Burg Birseck) is located in the municipality of Arlesheim in the canton of Basel-Country. Birseck Castle is also called "Untere Burg Birseck" or "Vordere Burg Birseck" and is one of four castles on a slope called Birseck that confines the plain of the Birs river.
The Eremitage building group that includes the castle is listed as a heritage site of national significance.[1]
Burg Reichenstein is the sister castle to Birseck and sits on a higher slope to the north.