Luis Prieto Zalbidegoitia (born 19 February 1979) is a Spanish retired professional footballer who played mainly as a centre-back.

[1] Coming through the ranks of Athletic Bilbao, he spent three seasons on loan at two Basque neighbours before establishing himself in the main squad.

[3] In the 2005–06 campaign, as Athletic finished 12th in La Liga, Prieto scored four goals in 36 games, notably the deciders (1–0 wins) at RCD Mallorca and with CA Osasuna.

[10][11] On 31 July 2009, Prieto was involved in a pre-season game against Ipswich Town, played in honour of the late Bobby Robson who died that morning, and scored an own goal in an eventual 3–1 loss to the Championship side.

[19][20] In September 2014,[21] three years after retiring, Prieto returned to Athletic Bilbao, where he held various roles at the club's academy until summer 2019.