The Algerian grabbed one goal and one assist as City returned to action following the World Cup break.
Mahrez was on target in the first of those encounters, curling a sensational effort into the far corner in a 3-2 Carabao Cup win over Liverpool.
It was a typically impressive strike from the winger, which would also ultimately be voted Nissan Goal of the Month for December.
Having helped Pep Guardiola's men to a hard-fought 3-1 triumph at Leeds in the Premier League, Mahrez was once again at his best against Everton on New Year's Eve.
Weaving through the challenges, the Algerian cut the ball back into the path of Erling Haaland for the game's opening goal.
The winger fought off the sizeable challenge of the Norwegian and Rico Lewis to claim his first Player of the Month prize for 2022/23.
Congratulations to Riyad on winning the award, and thank you to everyone who voted.