Club Atlético Osasuna B, usually known as Osasuna B, is a Spanish football club based in Pamplona, in the autonomous community of Navarre. Founded in 1962, it is the reserve team of CA Osasuna and currently plays in Tercera División, holding home matches at Instalaciones de Tajonar.
Osasuna B was founded in 1962 as Osasuna Promesas, being renamed in 1991. It first reached the third division in the 1982–83 season, then again in 1987, the latter spell eventually lasting more than two decades.
From 1994 until 2000 Osasuna B was not eligible for promotion, as the main side was playing in the second level.
As of 4 August 2012. Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.