Ángel Martínez Ortega (born 17 May 1991) is a Spanish professional footballer who plays for Greek club Asteras Tripolis F.C. as a left back.
Born in Barcelona, Catalonia, Martínez finished his development at RCD Espanyol. He made his senior debut for their reserves on 30 August 2009, starting in a 0–0 Segunda División B home draw against Sporting Mahonés CF.
On 20 August 2010, Martínez was loaned to fellow league club Real Jaén for one season. On 12 July of the following year he signed for another reserve team, Deportivo de La Coruña B in Tercera División.
Martínez returned to the third division on 1 August 2013, joining CD Guijuelo. He continued to compete in that level in the following years, representing Espanyol B and CF Reus Deportiu; he achieved promotion to Segunda División with the latter side, appearing in 32 matches in the process.
Martínez made his professional debut on 27 August 2016, starting in a 1–1 home draw to CD Mirandés. The following 13 June, he agreed to a two-year deal with Real Zaragoza also from the second tier.
Martínez moved abroad for the first time in his career on 4 July 2018, signing a two-year contract with Superleague Greece club Asteras Tripolis FC. He scored his first goal for them on 25 September in a 2–1 home win over Apollon Smyrnis F.C. in the group phase of the Greek Cup, adding another in the round of 16 against Athlitiki Enosi Larissa F.C. to help the hosts win 5–3 and qualify 7–6 on aggregate.