1921 Országos Bajnokság I (men's water polo) was the 15th water polo championship in Hungary. There were five teams who played one round match for the title.

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

• Gyarmati Dezső: Aranykor (Hérodotosz Könyvkiadó és Értékesítő Bt., Budapest, 2002.)

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