Serie B (men's water polo)

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Serie B

Country	Italy
Confederation	LEN (Europe)
Number of teams	40
Promotion to	Serie A2
Relegation to	Serie C
Domestic cup(s)	Coppa Italia
TV partners	Rai 2
Website	federnuoto.it
Current: 2023–24 Serie B

The Serie B di pallanuoto maschile is the third division of the Italian water polo male national championship.

40 teams participate in the tournament, which are divided into four groups consisting of ten teams. At the end of the regular season the top two teams of each group participate in the play-off phase, from which four winners emerge that achieve promotion to Serie A2. The teams ranked in tenth place of each group are directly relegated and are joined by the teams defeated in the play-outs. The play-outs consist of the eighth and ninth placed teams. This results in a total of eight relegations to Serie C.