With Moussa Dembele out injured, Leigh Griffiths made his first league start for Celtic since late December in the final Old Firm game of the season.
Scott Sinclair got Celtic off to the perfect start when he scored from the penalty spot after just seven minutes.
Just over 10 minutes later, Leigh Griffiths would add a second for Celtic.
After Callum McGregor played in Griffiths, the Scot could have squared the ball to Sinclair. Instead, the striker unleashed an unstoppable shot past Wes Foderingham in the Rangers goal.