The paper deals with the creation of the Slovak legal infrastructure after 1918, when Czechoslovakia was born. The political position of Slovakia and Slovaks in this state was generaly better than in the old Hungary.During the period of Austro-Hungarian dualism (1867–1918) only a limited number of Slovak lawyers worked in the Hungarian justice and state administration, majority of them worked as solicitors. The use of the Slovak language in the judiciary and public administration was also very limited. The first task for lawyers after 1918 was the creation of a complex Slovak legal terminology, because the Slovak language became the official language only recently. The journal Právny obzor, established in 1917 and the Union of Lawyers of Slovakia, which published this journal, played very important role in this proces. The third important factor was the creation of the first Slovak University in Bratislava in 1919. The Faculty of Law of Comenius University has worked since 1921, but the majority of professors came from the Czech lands. At the begining only one professor was Slovak, professor Augustín Ráth who became also the first Slovak rector of the University.