Arrast-Larrebieu (French pronunciation: [aʁast laʁbjø]; Basque: Ürrustoi-Larrebille)[3] is a commune in the Pyrénées-Atlantiques department in the Nouvelle-Aquitaine region of south-western France.

The D135 from the D11 in the west to Moncayolle-Larrory-Mendibieu in the south-east passes through the south of the commune and the hamlet of Larrebieu.

[3] Jean-Baptiste Orpustan indicated that the spelling in Basque Arrast is sometimes given with the determinant Ürrüxtoia meaning "hazel tree grove".

Sources: Origins: Paul Raymond noted on page 11 of his 1863 dictionary that the commune had a Lay Abbey, vassal of the Viscounts of Soule.

An enclosure with an earthen parapet (a protohistoric fort or Gaztelu zahar) at an altitude of 282 metres at a place called Gazteluxaga reflects the ancient past of the commune.