José Luis Diezma Izquierdo (born 22 September 1968) is a Spanish retired footballer who played as a goalkeeper, and is a manager.
In 1992, after two years as an undisputed starter, Diezma joined Real Betis in the second division, playing a key part in their promotion to La Liga in 1994.
However, after the arrival of Pedro Jaro, he was demoted to second-choice, only making his debut in the category on 19 May 1996, in a 1–0 home defeat of Deportivo de La Coruña.
In 1996, Diezma moved to fellow top-tier club Celta de Vigo, acting as a backup option to Richard Dutruel.
Completely ostracized by new manager Andoni Goikoetxea, Diezma did not feature in a single match for Numancia during the 1999–2000 campaign, being released in December.