Hill has spent nine seasons with Melbourne Storm

Hill, 29, a former Kangaroo Test player and NSW State of Origin star, will replace Luke Dorn who joins Salford.

"Scott's style is hard to find and he is a diminishing breed of talent," said Quins boss Tony Rea.

"He has an innate ability to read a game and make split-second decisions. His experience, professionalism and class will be of great benefit."

Hill, a stand-off or loose-forward, made his first-grade debut with Canterbury Bulldogs in 1996 before spending one season with the now-defunct Hunter Mariners.

He joined the Melbourne club in its inaugural season in 1998 and scored the club's very first try.

Scott missed the Storm's Grand Final victory in 1999 with a shoulder injury but made his Australian Test debut against the Kiwis in 2000 and later that year he played in all six games in the World Cup.

"I've had some great times with Melbourne and I want to enjoy and make the most of our run into the finals series with a club that has been such a big part of my life," said Scott.

"Heading for London is a big opportunity for me and one which I am really looking forward to. Harlequins are a professional outfit with a lot of ambition and that appealed to me."