Nikola Jokic.
Runners-up: Patrick Mahomes, A'ja Wilson.
The dominant players in their sports won titles this year - Mahomes won this award in 2020 and Jokic had yet to win, that perhaps was the tiebreaker, but the level of dominance by Jokic more strongly continued into this new season than has for Mahomes (it's hairsplitting) and he takes the title.
Here were all the monthly winners:
January-Mikaela Schiffrin
February-Patrick Mahomes
March- Caitlin Clark
April - Shohei Ohtani
May- Nikola Jokic
June - Novak Djokovic
July- Breanna Stewart
August- Noah Lyles
September-Coco Gauff
October-A'ja Wilson
November- Corey Seager
December- Dak Prescott
And here are all the previous winners.
1990: Joe Montana
1991: Michael Jordan
1992: Mario Lemieux
1993: Michael Jordan
1994: George Foreman
1995: Hakeem Olajuwon
1996: Michael Jordan
1997: Tiger Woods
1998: Mark McGwire
1999: Tiger Woods
2000: Tiger Woods
2001: Barry Bonds
2002: Barry Bonds
2003: Lance Armstrong
2004: Peyton Manning
2005: Reggie Bush
2006: Roger Federer
2007: Tom Brady
2008: Usain Bolt
2009: Manny Pacquiao
2010: Maya Moore
2011: Aaron Rodgers
2012: LeBron James
2013: LeBron James
2014: Madison Bumgarner
2015: Serena Williams
2016: Michael Phelps
2017: Tom Brady
2018: Breanna Stewart
2019: Megan Rapinoe
2020: Patrick Mahomes
2021: Giannis Antetokounmpo
2022: Lionel Messi/Steph Curry
2023: Nikola Jokic