Former England and Leicester Tigers outside centre Ollie Smith will play for Harlequins next season.
The 27-year-old, who currently plays for Montpellier, hopes the move back to England will aid him win a place at the 2011 World Cup in New Zealand.
"I am looking forward to coming back and joining such a prestigious club with so much history," Smith said.
Quins have also signed Northampton's England Under-20 hooker Joe Gray and Argentina centre Benjamin Urdapilleta.
