Betfred will remain title sponsor of the Championship and League 1 until at least the end of 2021, the RFL has announced.
The betting firm has also doubled its financial backing of the professional game below the top level.
Betfred became title sponsor of the two divisions in 2018, after having previously agreed a deal to sponsor Super League.
The company also recently became sponsor of the Women’s Super League.
RFL CEO Ralph Rimmer said: “Betfred’s energy and enthusiasm off the field mirrors the product on the field, where clubs and players are beginning to gear up for what will be a thrilling play-off series in two vibrant competitions.”
Betfred boss Fred Done said: “We’ve enjoyed a great relationship with Rugby League and its supporters and therefore I am delighted that we are now able to further extend our sponsorship of the Championship and League 1 in line with our recent Super League and Women’s Super League agreements.
“Sport provides tremendous content for our digital platforms and we are delighted that through deals like these we are able to be a part of it.”