The South African, who joined the club midway through the 2022 season, scored 200 runs in five County Championship outings and a further 394 runs in the Royal London Cup
Pieter Malan has re-signed for Middlesex for the 2023 season.
The South African batter, who joined the club midway through 2022, helped Middlesex secure promotion to Division One with 200 runs in five LV= Insurance County Championship outings.
He scored a further 394 runs, including one century and four fifties, and took one wicket in eight Royal London Cup appearances.
Malan, who earned three Test caps for South Africa in January 2020, will be available for the whole season.
Malan in action for Middlesex in the 2022 Royal London Cup [Harry Trump/Getty Images]
Commenting on his return to Middlesex, Malan said: "I'm delighted to be returning to Middlesex and Lord's next season. I was made to feel so welcome from day one, which made the decision to return very easy.
"Being part of the Championship promotion push at the end of the season was fantastic and I'm really excited to see the team continue their journey in Division One next year."
Head of men's performance cricket, Alan Coleman, added: "We are thrilled that Pieter will be returning to Middlesex for the 2023 season. He made a huge impact in his time with the club this summer and we can't wait to have him back in the home dressing room next year.
"He brings not only a huge amount of quality and experience to the side, but also a real drive, passion, and commitment to succeed. He works extremely hard at his game and is the ideal role model for our younger players to play alongside and learn from.
"Right from the outset this summer he hit the ground running, finding good form early, and consistently making an impact at the crease. The innings of 93 he hit against Worcestershire in our final game was the standout innings of the season for me, given the really tough conditions, the challenging surface, and the importance of the match situation – it was absolute world-class.
"We can't wait to welcome Pieter back next year and look forward to him joining up with the side again."