Fabián Ruiz Peña also known simply as Fabián, is a Spanish professional footballer who plays as a central midfielder for Ligue 1 club Paris Saint-Germain and the Spain national team.

Born in Los Palacios y Villafranca, Seville, Andalusia, Fabián joined Real Betis' youth setup in 2004, aged eight, after starting it out at EF La Unión de Los Palacios. Ruiz has credited his mother with bringing him into football. He was promoted to the reserves in July 2014, and made his senior debut on 21 September, coming on as a second half substitute in a 4–1 home loss against Marbella in the Segunda División B championship.

After representing Spain at under-19 and under-21 levels, Fabián was called up to the Spain senior team by manager Luis Enrique on 15 March 2019, for two UEFA Euro 2020 qualifying matches against Norway and Malta. He debuted on 7 June 2019 in a UEFA Euro 2020 qualifier against the Faroe Islands, coming on as a substitute for Isco in the 74th minute. Four days later, he made his full debut, starting alongside Sergio Busquets and Dani Parejo in midfield against Sweden, assisting Mikel Oyarzabal's goal in the 87th minute of the 3–0 win.

A left-footed central midfielder, Fabián is known for his vision, passing, ball control and dribbling skills, as well as his tactical versatility, and can play in a number of formations, such as 4–4–2, 4–3–3, and 4–2–3–1. He can also play as a defensive midfielder or an attacking midfielder.