Juan José Olalla Fernández (born 13 January 1980) is a former Spanish professional footballer who played as a defender.

Born in Madrid, Olalla finished his youth career with Real Madrid CF,^[1] making his senior debut in the 2000–01 season with the reserves in Segunda División B. On 6 November 2002, he made his main-squad and Copa del Rey debut, coming on as a substitute of Santiago Solari in a 4–0 away win against Real Oviedo.^[2] He was choiced from Real Madrid B by Carlos Queiroz for main team 2003–04 Champions League campaign,^[3][4] but did not play a single match in this tournament. On 2004-05 season, Olalla was loaned to UE Lleida of the second division.^[5] Olalla made his Segunda División debut on 27 February 2005 as a starting central defender against Polideportivo Ejido.^[6]

Since the 2005-06 season Olalla played at a third level of Spanish football system and below. His last team was CU Collado Villalba, for which he played in the 2020-21 season.^[7]

• Juanjo Olalla at BDFutbol
• Juanjo Olalla at LaPreferente.com (in Spanish)
• Juanjo Olalla at playmakerstats.com (English version of ceroacero.es)
• FutMadrid profile (in Spanish)