The Serie B (Italian pronunciation: [ˈsɛːrje ˈbi]) is the second division of women's football in Italy.

Until 1972, it was the second and last division of women's football in Italy because it was organized by the regional committees.

In 1973, it was transformed into an interregional championship and, until 2002, it was the second highest tier, equivalent to the men's Serie B.

The Serie B championship has had different formats over the years, maintaining the division of the participating teams into several groups according to geographical distribution until the 2017/18 season.

In the years in which Serie B was the third tier of Italian football, the league format consisted of four or five groups of 12 teams each on average.