Albert Arenas Ovejero (born 11 December 1996) is a Spanish motorcycle racer who is set to compete in the 2026 Supersport World Championship with AS Racing Team aboard a Yamaha. He last competed in the 2025 Moto2 World Championship, riding for Gresini Racing. Arenas is well known for winning the 2020 Moto3 World Championship, becoming the oldest Moto3 World Champion aged 23 years and 347 days.

Arenas debuted in the Moto3 World Championship in the last race of the 2014 season in Valencia, as he was signed by Calvo Team to replace the injured Eric Granado. In 2015, he was the FIM CEV Moto3 Junior World Championship runner-up.

In the 2016 Moto3 season, Arenas first made three appearances with the Aspar Team, two as a wild card entry and one as the substitute for the injured Jorge Martín,

In 2016, Arenas later joined the Peugeot MC Saxoprint team as the permanent replacement for Alexis Masbou.

In 2020, Arenas finished the 2020 Moto3 World Championship season as the world champion, taking 174 points with 3 wins and 5 podiums, edging out both Tony Arbolino and Ai Ogura by 4 points.

Arenas joined the Aspar Moto2 team in the 2021 season. It was a relatively weak season for Arenas, spending most of it getting up to grips with the bike, scoring only 28 points in 18 races, and finishing 21st in the standings. The 2022 season was better, as Arenas collected 90 points, finishing 12th in the standings, with his season best result a 4th place from Rimini.

Earning a ride at a top team, Arenas competed for the Red Bull KTM Ajo Moto2 team in the 2023 season. Arenas went on to finish the season 14th in the standings, collecting 85 points, and a season's best 3rd place in Catalonia, his first podium in the intermediate class. His teammate Pedro Acosta won the title by a comfortable margin, 83 points.

Arenas officially joined Gresini Racing Moto2 for the 2024 Moto2 season, where he was paired with teammate Manuel González.