The 30-year-old has signed a two-year contract and joins Queens Park Rangers after his release from Italian side Parma.
Rozser helped Watford win promotion to the Premier League last season while on loan at the club.
Tozser told Queens Park Rangers’ official website: “I’m so pleased to be here.
“I think England is the best place in Europe to play football, so I was really happy that there was a chance to stay here longer.
“I had a fantastic time at Watford, winning promotion last season. Now I’m looking forward to the future with QPR. I will do my best for the team. I feel at my peak, and physically good.
“I know Akos Buzsaky was loved at QPR, and all players from Hungary who come here give their all. I also know the team have made a good start in the league. Let’s keep that going. It was a long summer for me – I can’t wait to get back in business.”
