Greeba Castle (Scandinavian: Gnipa, a peak) is situated between the 5th Milestone and 6th Milestone road-side markers on the Snaefell Mountain Course used for the Isle of Man TT Races on the junction of the primary A1 Douglas to Peel road in the parish of German in the Isle of Man. Greeba Castle is situated adjacent to the primary A1 Douglas to Peel road in the main Douglas to Peel central valley.