The subject of this paper is the Party of Rights' ideology on the eve of the First World War, on the basis of the Party of Rights' academic youths' activity at the Croatian university in the stated period. The author starts from an assumption that the political parties in Croatia on the eve of the First World War did not essentially differ with regard to the constitutional position of Croatia within the Monarchy, but according to their relation towards the position of the Serbs inside the Croatian nation. The second hypothesis is that their standpoint concerning the Serbs was mainly conditioned by their opinion regarding the joining of Croatian countries into the community with Serbia. The author therefore observes three types of the mentioned relationship. Some parties, mostly those of Yugoslav national-political orientation, craved for complete equality of Croats and Serbs in Croatia. A part of the Party of Right, which on the eve of the war accepted the possible realization of Croatian statehood even in the Yugoslav context, accepted the existence of Serbs within the Croatian political nation. The other part of the Party of Right, which unconditionally rejected the Yugoslav framework, continued with the non-recognition of the Serbs' existence in Croatia, considering them to be a group of non-Serbian, Vlach origin.