Hauraki, 25, joined the Crusaders at the beginning of last season and impressed as the club reached the play-offs, attracting interest from several Super League clubs, before opting to make the move to Headingley.
Hauraki said: “Leeds is a massive club and I have been really impressed by the set up here. I enjoyed my first season in Super League with the Crusaders last year and I think I will be better for that experience this season. I can not wait to get started with the boys and get the chance to play for Leeds Rhinos.”
The financial troubles gripping the Welsh club at the moment had led Hauraki to looking at a move home, but he is opted to stay on these shores, after scoring 11 tries in 27 appearances for Crusaders last season.
Chief Executive Gary Hetherington said, “We are delighted to be adding such an outstanding player to our squad. Weller handled the transition from NRL to Super League really well last season with the Crusaders and his explosive running and tough defence will help the team.”
Head Coach Brian McDermott added, “We are looking forward to having Weller with us on Monday to start pre-season training. He is a player with plenty of potential who spent a long time with Parramatta in his formative years before coming over to the UK last season. He will give us options in our pack and is a valuable addition to our squad.”