Balansun is a French commune of the Pyrénées-Atlantiques department in the Aquitaine region of south-western France.
The inhabitants of the commune are known as Balansenais or Balansenaises.
Balansun is a commune in the former province of Béarn located some 6 km east of Orthez and 4 km north of Argagnon. Access to the commune is by the D946 road from Arthez-de-Béarn in the east which passes through the centre of the commune south of the village and continues south-west to join the D817 west of Castétis. Access to the village is by the Chemin de l'Eglise which branches north off the D946 on the western side of the commune. The commune is mixed forest and farmland.
The commune is located in the Drainage basin of the Adour with the Ruisseau de Clamondé forming the southern border of the commune as it flows west to join the Gave de Pau west of Castetis. Three streams flow though the commune from east to west into the Ruisseau de Clamondé gathering many tributaries in the commune/