Scruton, who is 23 years old, has made 96 appearances for the Rhinos, including 25 this season and Bulls Coach Steve McNamara is delighted to have Scruton on board for the next three years.
"Nick has been playing in a very strong Leeds side for the last three or four years and he has gone very well. I'm really pleased to able to bring him to the Bulls and also by the fact that he wanted to come here to Bradford as well. Nick's young, English and has got a great deal of ambition whilst he still has plenty of improvement in him. He is tough and fit and a very vocal player who he will add a lot to our pack next year and I'm looking forward to working with him.
He's someone who bases his game on his sheer love and enthusiasm for the sport and he is a great addition to our squad."