Jon Aurtenetxe Borde (born 3 January 1992) is a Spanish footballer who plays mainly as a left back but also as a central defender for Australian club Adelaide Comets.
Born in Amorebieta-Etxano, Biscay, Aurtenetxe joined Athletic Bilbao's youth system at the age of 10, arriving from neighbouring SD Amorebieta and being a finalist in the Copa del Rey Juvenil in 2009 (he would conquer that competition the following year). On 16 December of that year, even before playing his first game with the reserves, the 17-year-old appeared for the first team in the UEFA Europa League, featuring the full 90 minutes in a 0–3 group stage home loss against SV Werder Bremen.
Aurtenetxe made his La Liga debut on 28 August 2010, starting and being booked in a 1–0 win at Hércules CF. His season was curtailed by a serious shoulder injury, and he was definitely promoted to the main squad for 2011–12 under new manager Marcelo Bielsa; he played 54 official matches during the campaign and scored four goals, to help the Basques reach both the Copa del Rey and the Europa League finals – he netted an important one in the club's 1–2 away loss against Sporting CP in the latter competition's semi-finals (4–3 aggregate win).