The 2024 J2 League, also known as the 2024 Meiji Yasuda J2 League (Japanese: 2024 明治安田J2リーグ, Hepburn: 2024 Meiji Yasuda J2 Rīgu) for sponsorship reasons, was the 26th season of the J2 League, the second-tier Japanese professional league for association football clubs, since its establishment in 1999. It was the tenth season of the league since its rebrand from J.League Division 2.

For the first time since 2011, the number of the clubs in the league decreased from 22 to 20.

This season, there were three automatic relegation spots to the J3 League (one more than the 2023 season) and two clubs gained automatic promotion to the J1 League. Like the previous season, the winner of the J2 promotion play-off were promoted to the top tier.

The league and match format was announced on 19 December 2023. The league began on 23 February and ended on 10 November in a round-robin format of 38 matches.

The J1 promotion play-off semi-finals took place on 1 December with the final taking place on 7 December.

Zweigen Kanazawa and Omiya Ardija were relegated to the 2024 J3 League, finishing the previous J2 League season as 21st and 22nd-placed teams, respectively.

Yokohama FC were the sole team to be relegated from the J1 League, after only one season in the top flight.

Both Machida Zelvia and Júbilo Iwata are promoted to the J1 League as champions and runners-up, respectively, of the previous J2 League season. Tokyo-based Machida will make their debut in the top flight of Japanese football, while Júbilo will make their immediate comeback to the J1. Joining the duo are Tokyo Verdy, who finished 3rd in 2023 and earned promotion after winning the promotion play-offs, thus making their first top flight appearance since 2008.