In this paper the author analyses the control mechanisms of administrative court activity. The author considers them in their complexity and inclusiveness through control mechanisms which enable constitutionality and legality control of court decisions and through the control mechanisms proscribed by organisational regulations the aim of which is the control of the legality of judges' and presidents' of court work. The first spectre of control mechanisms mainly derives from the fundamental law which regulates administrative dispute (Administrative Dispute Act), and partly from the provisions of the Constitution and constitutional law on the Constitutional Court of the Republic of Croatia. The other spectre of control mechanisms is archetypically connected to organisational provisions. Even though these two spectres of control mechanisms emerge from different kinds of provisions, these two together undoubtedly constitute one complementary whole of control mechanisms.