Briscoe, 23, joins the Rhinos on a five-year contract after rejecting interest from NRL outfit Cronulla.
The winger made 130 appearances for the Airlie Birds after breaking onto the Super League scene in 2008, and he was yesterday named in Steve McNamara’s 24-man England squad for the upcoming World Cup.
“I was conscious that I did not want to rush into a decision and took my time before deciding what was the right move for me and my career.
“I came very close to moving to Australia and signing for Cronulla on a three year deal but the attraction of Leeds and the exciting times that are ahead here at Headingley Carnegie changed things for me.
“I spoke to a couple of the Leeds lads who are in the England squad and they could not speak highly enough about how the club is run on and off the field.
“Likewise, my younger brother Luke is already here and he loves being part of the Rhinos. The chance to maybe play alongside him in the future is something that remains an ambition for both of us.”
Rhinos head coach Brian McDermott added, “Tom is a fantastic talent and someone who I am sure will be a considerable addition to our existing squad for next season.
“As this season as shown, to compete at the highest level in the modern era takes a strong squad that is able to deal with the challenges that are thrown at you over the course of a season and adding a player of Tom’s quality to our group is a huge boost for us.
“Of equal importance to his talent and ability is Tom’s character and he is highly regarded by everyone who has worked with him throughout his career.
Briscoe has scored 100 tries in his career to date, with 17 of those coming in 2013.