Aitor Arregi Galdos (born 20 May 1977) is a Spanish Basque filmmaker and screenwriter.

He won the Goya Award for Best Original Screenplay for the 2017 film Giant and has been nominated for the Goya Award for Best Director three times, for Giant, The Endless Trench (2019) and Marco, the Invented Truth (2024).

After graduating in Business Administration from Mondragon University, he studied filmmaking at the Sarobe Centro de Artes Escénicas.

[1] In 2002, Arregi started the film production company Moriarti Produkzioak together with Asier Acha, Xabier Berzosa, Jon Garaño, Jorge Gil, and Jose Maria Goenaga.

[1] The productions of Moriarti Produkzioak are characterised by teamwork, including directing, and by the exchange of roles between the members.