Back-rower Josh Tonks will ply his trade for Hunslet during the 2020 season.
The 28-year-old made 19 appearances for the League 1 side last term, scoring eight tries.
Hunslet coach Gary Thornton said: “I’m delighted. Josh is a very valuable player to have around, on and off the field.
“He rarely has a poor game and you are guaranteed 100% effort from him.
“He’s a very popular player, both within the squad and with our supporters, and he’s highly regarded by opposing clubs, which says a lot.
“Josh is a key retention in every way. He wants the ball in his hands all the time and if that doesn’t happen he soon lets me and his half-backs know about it.
“He’s a big left-side threat for us and is very much our go-to man. He runs superb lines as well which is why he gets over the try-line so regularly.”