Arnold I García (also Arnaldo Garcés, Arnau Nonat, Arnaud, or Arnaut) (died 960) was the first Count of Astarac from 926.
Arnold was the youngest son of García II Sánchez of Gascony and Amuna.
Arnold inherited Astarac, between Fézensac and Bigorre, comprising Pardiac and Magnoac.
Arnold was succeeded by his son García of Astarac.
The chief sources of his reign are the Cartulary of Auch and the Códice de Roda.