Vaterpolski klub Mornar is a professional water polo club based in Split, Croatia.

The club founded in 1949 under the name "Plivačko-vaterpolski klub Mornar" and the golden age for this team has coincided with the period between 1950 and 1961, when it won 5 times the Yugoslav League.

thanks to the playing quality that had the following roster: Deni Marinković, Renco Posinković, Vojko Šegvić, Branimir Bucan, Branislav Zovko, Boris Katić, Nenad Matosic, Zoran Filipović, Mladen Hraste, Tonko Bezina, Teo Novaković, Rino Katunaric, Josko Krekovic, Srdjan Trgo.

However, in the Croatian league introduced in 1992, the club has never managed to win the national title.

The roll of honour sees the supremacy of the Jug and Mladost and also the appearance of another club of Split, POŠK, champion in 1999.