The National Championship I (Hungarian: Nemzeti Bajnokság I, also DHL Nemzeti Bajnokság I for sponsorship reasons) is the second level of domestic club rugby union in Hungary after the Extraliga.

There is promotion and relegation involved between National Championship I and the next level down, National Championship II (the second division).

Eight teams take part and the competition is composed of a single league.

Teams are awarded four points for a win, a bonus point for scoring four or more tries, and a bonus point for losing by seven points or less.

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