Wardle, a Scottish international, made 141 appearances for Huddersfield before moving to the NRL last December.
The 25-year-old, who was on a three-year contract, has played 15 times for Newcastle this year, but failed to settle in Australia.
He said: “I would just like to say thank you to Newcastle for working alongside me in what has been a hard time adjusting to life Down Under.
“Rugby careers are short so happiness is key and sometimes things don’t work out, which is unfortunately the case.
“I am really looking forward to getting back home, getting my family settled and teaming up with Daryl [Powell, Tigers’ coach] and the rest of the boys for the 2018 campaign.”
Powell said: “Joe Wardle is a player I have been a fan of for a number of years since his time at Huddersfield.
“I am delighted that on returning to England he has decided we are the club to help him achieve his goals in the game.
“He is a tough player on both sides of the game, being a great line runner on attack and a solid, aggressive defender.
“He can play in both centre and back-row positions which strengthens us significantly and grows our competition for places within an already awesome squad.
“I look forward to his arrival at the club and getting him accustomed to how we play.”