The party can trace its history to the founding of a socialist support group for like-minded men in Pamplona in August 1902.

[3] The former Secretary-General was Roberto Jiménez, who won 70.5% of the vote in an election at the ninth regional congress on June 28, 2008.

In February 2014, during the latest crisis affecting the credit of UPN high-ranking officials in government,[4] PSN refused to impeach regional president Yolanda Barcina despite the clarity of the allegations and wide consensus among Navarrese political forces on the severity of the institutional crisis.

Instead, the PSN leader Roberto Jimenez focused on "thoroughly condemning" and extensively elaborating on verbal abuse hurled by a crowd of protesters voicing their anger at Y. Barcina and other UPN officials in Tafalla.

[5][6] In 2011 members disaffected with PSN's alliance policy contributed to the foundation of the coalition Izquierda-Ezkerra—2 MPs in the Parliament of Navarre (July 2015).