pˈɛtɹəvˌæɹɐdˌɪn fˈɔːɹtɹəs, ;, nˈɪkneɪmd "dʒɪbɹˈɔltɚɹ ˌɔn slˈæʃ ʌvðə dˈænuːb", ɪz ɐ fˈɔːɹtɹəs ɪnðə tˈaʊn ʌv pˈɛtɹəvˌæɹɐdˌɪn, ɪtsˈɛlf pˈɑːɹt ʌvðə sˈɪɾi ʌv nˈoʊvi sˈæd, sˈɜːbiə.
Petrovaradin Fortress (, ; ), nicknamed "Gibraltar on/of the Danube", is a fortress in the town of Petrovaradin, itself part of the City of Novi Sad, Serbia.