For the theological use of Old Covenant, see Mosaic Covenant, Covenant (biblical) and Old Testament.

The Old Covenant was the name of the agreement which effected the union of Iceland and Norway. It is also known as Gissurarsáttmáli, named after Gissur Þorvaldsson, the Icelandic chieftain who worked to promote it. The name "Old Covenant", however, is probably due to historical confusion. Gamli sáttmáli is properly the treaty of 1302 mentioned below and the treaty of 1262 is the actual Gissurarsáttmáli.