Oriol Riera Magem (Catalan pronunciation: [uˈɾjɔl ˈrjeɾə]; born 3 July 1986) is a Spanish retired footballer who played as a striker, currently a manager.
 After starting out at Barcelona, he went on to amass La Liga totals of 102 matches and 23 goals over four seasons, with Osasuna and Deportivo. He added 148 games and 31 goals in the Segunda División for four clubs, and also competed professionally in England and Australia in a 16-year career.
 Born in Vic, Barcelona, Catalonia, Riera played youth football with FC Barcelona, but spent the vast majority of his tenure with the club in representation of the C and B teams. His official input with the main squad consisted of 13 minutes in a 4–0 away win against Ciudad de Murcia in the round of 32 of the Copa del Rey – when he was still a junior – on 17 December 2003.
 After leaving the Camp Nou, Riera resumed his career in the Segunda División B, where he played with Cultural y Deportiva Leonesa and Celta de Vigo B. He appeared in five Segunda División matches with the latter's main squad, four as a starter.
 Riera competed in the second tier from 2009 to 2013, with Córdoba CF and AD Alcorcón. He scored 18 goals in his second year with the latter side, (including a hat-trick in a 3–1 victory at UD Las Palmas on 8 September 2012), helping them to the promotion play-offs.
 On 5 July 2013, Riera signed for three seasons with CA Osasuna. He made his La Liga debut on 18 August, coming on as a second-half substitute in a 1–2 home loss to Granada CF. His first goal in the competition came on 20 September of the same year, in a 2–1 win over Elche CF also at the El Sadar Stadium.
 On 28 June 2014, after Osasuna's relegation, Riera agreed to a three-year deal with Wigan Athletic of the Football League Championship, for a reported £2 million fee. He scored his first goal for his new team on 23 August, the only against Blackpool in a 1–0 victory at the DW Stadium.
 Riera returned to his country's top division on 7 January 2015, signing on loan to Deportivo de La Coruña until the end of the season. On 30 June he agreed to a permanent deal at the Estadio Riazor, having narrowly avoided relegation.
 On 12 August 2016, Riera returned to his former club Osasuna after agreeing to a one-year loan deal. He scored his first goal for them on 10 September, but in a 5–2 away loss to Real Madrid. He netted another in the 3–3 home draw with Valencia CF (adding an own goal), in a relegation-ending campaign.
 In July 2017, aged 31, Riera cut ties with Deportivo and joined A-League side Western Sydney Wanderers FC as a marquee player shortly after. He scored 15 times in his first season, but his team could only finish seventh.
 In April 2019, the club confirmed that Riera was not renewing his contract.
 On 25 July 2019, free agent Riera agreed to a one-year contract with second division newcomers CF Fuenlabrada. On 10 August of the following year, after just one goal in 35 competitive appearances, he announced his retirement at the age of 34 and the desire to remain associated to the sport as manager.
 Riera played his first match for the representative Catalan national team on 30 December 2013, scoring the last goal in a 4–1 win over Cape Verde at the Estadi Olímpic Lluís Companys.
 In October 2020, Riera was named assistant coach of Alcorcón's reserves.
 In July 2022, Riera was appointed as head coach of Segunda Federación club Tudelano, signing a one-year deal. On 16 March 2023, his contract was extended for another season. However, six months later, Riera was sacked.