1931 Országos Bajnokság I (men's water polo) was the 25th water polo championship in Hungary. There were nine teams who played one round match for the title.

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (August 2012)

* M: Matches W: Win D: Drawn L: Lost G+: Goals earned G−: Goals got P: Point

• History of water polo

• Gyarmati Dezső: Aranykor (Hérodotosz Könyvkiadó és Értékesítő Bt., Budapest, 2002.)
• Magyar Sport Almanach 1931-1934

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