The Scottish Professional Football League confirmed the five-year deal, which will runs until the end of the 2025-26 season, is the SPFL’s largest to date and has been welcomed by chief executive Neil Doncaster.
He said: "This is an enormously significant partnership for our member clubs, and for Scottish football as a whole.
"Our discussions with cinch have been extremely positive and the duration of the sponsorship agreement demonstrates their long-term commitment to Scottish football.
"Despite the economic situation and the challenging nature of the global sponsorship industry generally, this is the largest-ever sponsorship in the SPFL era.
"It's a ringing endorsement of the enduring popularity of Scottish football, not only north of the border but right around the world.
"It's an exciting time for the Scottish game and I look forward to building on this new partnership as we continue to showcase Scottish football and maximise its exposure to a global audience."
There was no title sponsor for the leagues last season after a deal with betting company Ladbrokes expired in 2020.
Cinch is also principal partner of England Cricket, and sponsor Spurs.
Chief Customer Officer Robert Bridge said: “Scottish football has a UK audience of over 20 million but more importantly, it is the heartbeat of the Scottish community. As football fans make a return to stadiums for the new season cinch looks forward to being there alongside them for all those celebratory moments we’ve missed so much as we continue to make buying a car as faff-free as possible.”