Ad Casub (Arabic: أد كاسب) is a village in western Eritrea. It is located in Gogne District in the Gash-Barka region.

Nearby towns and villages include Algheden (19.3 km or 10.4 nmi), Adal (15.6 km or 8.4 nmi), Kieru (20.7 km or 11.2 nmi), Markaughe (10.6 km or 5.7 nmi), Hambok (19.6 km or 10.6 nmi) and Antalla (16.5 km or 8.9 nmi).