Wolves sign Uruguayan defender Bueno from Girona
No financial details were disclosed but British media reported a fee of around £8.5 million.
Bueno, who has two caps, joined Girona in 2019 on a five-year contract as a free agent and has made 120 appearances for the La Liga club in all competitions.
Bueno missed the first two games of the season with a hamstring injury but was on the bench for Girona's last game.
He made his Uruguay debut in March under former Leeds United boss Marcelo Bielsa.
"He's six foot four inches and aggressive, as you'd expect from a Uruguayan centre-back, but he can play too and gives us a good balance," said Wolves sporting director Matt Hobbs.
"He's a perfect fit for what we've been looking for."
Wolves are away to Crystal Palace on Sunday in their next league game.