Mariano, 24, joined the Wildcats at the start of 2011 on an initial one-year contract but has been rewarded for his form that has brought five tries in 12 appearances.
He said: I’m really happy to sign the new contract. I’m thoroughly enjoying my time at the club and playing some of the best rugby of my career at the moment. The club gave me a chance to prove what I can do and I wanted to repay that by staying loyal and signing the contract extension.”
The deal provides a timely boost for the Wildcats ahead of their crunch Challenge Cup fifth round tie against Castleford on Saturday.
Wildcats Head Coach John Kear added: “The Wildcats are very pleased that Frankie has pledged his future to the club as a thank you to the club giving him an opportunity which is widely acknowledged that he has taken. We look forward to working further with Frankie to fulfil his obvious potential and develop him into an outstanding British back row forward.”
Chief executive James Elston has also revealed that the club are close to agreeing a new two-year deal with young half-back Matty Wildie.