The paper deals with the definition and differentiation of individual acts of public authorities from administrative acts, emphasizing the right to a fair trial in the context of the Constitution of the Republic of Croatia (Official Gazette, numbers 56/90, 135/97, 113/00, 28/01, 76/10, and 5/14) and the Convention for the Protection of Human Rights and Fundamental Freedoms (Official Gazette - International Treaties number 18/97, 6/99 - consolidated text, 8/99 - correction, 14/02, 1/06, and 13/17). It examines the legislative framework of judicial control over individual acts, analyzing relevant laws and regulations that govern such control. The paper also provides an analysis of the case law of the Constitutional Court of the Republic of Croatia, offering examples where violations of the right to access to the courts have been established in cases such as state aid in agriculture, appointments and dismissals of members of administrative boards in institutions, and the reconstruction of buildings after a flood. Special attention is given to an example in which the Constitutional Court did not find a violation of the right to access to the courts because the petitioner did not use the regular legal remedy. The paper also discusses the case law of assessing the constitutionality of laws and the constitutionality and legality of other regulations, highlighting the unconstitutionality of the Regulation on the Implementation of Measure 202 - "Preparation and Implementation of Local Strategies for Rural Development" within the IPARD program (Official Gazette, numbers 24/13, 36/13, 112/13, 45/14, and 132/14) adopted by the Minister of Agriculture and the provisions of the Agriculture Act (Official Gazette, number 118/18).