The Tercera División de Futsal, formerly known as Primera Nacional B is the fourth futsal pyramid in Spain. It was founded in 1990 and is managed by Football Federation of every autonomous community. The Tercera División is an amateur level.
The Tercera División de Futsal consists in 23 groups. Every group corresponds to one or two Spanish regions. There are in total 337 apprx. teams. Every group champion and the best four qualified teams are promoted to Segunda División B. Conversely, the bottom two or three teams of every group are relegated to Regional leagues.
Since 2011–12' season onwards, Primera Nacional B is known as Tercera División.