Theo Bernard François Hernández (born 6 October 1997), known simply as Theo, is a French footballer who plays for Spanish club Deportivo Alavés on loan from Atlético Madrid as a left back.
Born in Marseille, Theo joined Atlético Madrid youth setup in 2008, aged ten. After progressing through the youth categories, he was promoted to the reserves in Tercera División in the 2015 summer.
Theo made his senior debut on 30 August 2015, starting in a 4–3 away win against CD Puerta Bonita. On 3 February of the following year, he renewed his contract; two days later, he was called up to the main squad for a La Liga match against SD Eibar due to injuries, but remained an unused substitute in the 3–1 home win.
On 4 August 2016, Theo extended his contract with the club until 2021, being immediately loaned to fellow top tier club Deportivo Alavés for one year. He made his professional debut late in the month, starting in a 0–0 home draw against Sporting de Gijón.
Theo's father, Jean-François, was also a footballer. A central defender, he too played for Atlético Madrid. His elder brother Lucas, also a defender, was also groomed at Atleti.