This paper is about analyzing the presence of open access content on the websites of university libraries. Theoretical part of the paper explains the term open access of scientific information as well as its importance for the research community. Initiatives and documents that encourage the development of an open approach and the forms of its realization are mentioned: the Green Way (self-promotion and network repository construction) and the Golden Way (publication in journals which are in open access). Different ways of financing open access as well as copyright issues are explained. An analysis of the availability of open access material on the websites of Croatian and Irish university libraries was made. Eight websites of six public and two private universities from Croatia and seven Irish universities. To summarize, the results are better when looking at Irish universities, as expected, and according to the analysis these are the results for Croatian university libraries: presence of university repositories 9/10, presence of their own digital material 5/10, presence of educational material 7/10, searchable open access material through library catalogs (e magazines 7/10, e books 0/10, printed textbooks 7/10, online editions 4/10, published manuals 6/10, online editions 0/10). The data for Irish university libraries websites is as following: presence of university repositories 7/7, presence of their own digital material 5/7, presence of educational material 5/7, searchable open access material through library catalogs (emagazines 6/7, e-books 1/7, printed textbooks 6/7, online editions 3/7, published manuals 3/7, online editions 2/7).