| Competition: | J.League Division 2 |
| Season: | 2013 |
| Winners: | Gamba Osaka 1st J2 title 2nd D2 title |
| Promoted: | Gamba Osaka Vissel Kobe Tokushima Vortis |
| Relegated: | Gainare Tottori |
| League Topscorer: | Kempes (22 goals) |
| Matches: | 462 |
| Total Goals: | 1212 |
| Highest Attendance: | 24,813 Sapporo vs Kitakyushu |
| Lowest Attendance: | 1,104 Ehime vs Kumamoto |
| Average Attendance: | 6,665 |
| Prevseason: | 2012 |
| Nextseason: | 2014 |
The 2013 J.League Division 2 season was the 42nd season of the second-tier club football in Japan and the 15th season since the establishment of J2 League. The regular season began on 3 March and ended on 24 November, followed by the promotion play-offs among four clubs ranked between 3rd and 6th at the end of regular season. Gamba Osaka became champions, and Vissel Kobe became runners-up, both returned to J1 immediately after one season at J2. The other promoted team was third runners-up (fourth placers) Tokushima Vortis, who won the promotion playoff final, defeating Kyoto Sanga FC. With the win, Vortis made their J1 debut, becoming the first professional Shikoku football club to compete in the top division of their national league.
Ventforet Kofu and Shonan Bellmare, champions and runners-up in the previous season, and Oita Trinita, winners of the promotion play-offs for 2012, were promoted to J1, then Consadole Sapporo, Vissel Kobe, and Gamba Osaka were relegated to J2 instead. Sapporo returned to J2 only after one season in the top-flight, and Kobe returned to J2 second time after 2006 season, while Gamba suffered their very first relegation to the second-tier after J.League Division 2 was established in 1999, and the first relegation since their former organization, Matsushita Electric Soccer Club, were relegated after the 1986–87 season of JSL.
V-Varen Nagasaki, champions of the 2012 Japan Football League, were promoted to J2 while F.C. Machida Zelvia, promoted to J2 from the previous season and ranked 22nd, were relegated back to 2013 Japan Football League only after spending one season in J2.
In February, Thespa Kusatsu changed their name to Thespakusatsu Gunma.
The participant clubs were as follows:
2013 J.League Road To J1 play-offs (2013 J1昇格プレーオフ)
Teams that finished 3rd to 6th participate in play-off series for the last J1 promotion berth.
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If the score was tied after 90 minutes, no extra time was played and the winner was the team with the best league ranking.
----Tokushima Vortis were promoted to 2014 J.League Division 1
2013 J2/JFL play-offs (2013 J2・JFL入れ替え戦)
The last-placed Gainare Tottori faced 2013 Japan Football League runners-up Kamatamare Sanuki in a two-legged playoff series.--------Gainare Tottori was relegated to 2014 J3 League
Kamatamare Sanuki was promoted to 2014 J.League Division 2
| Month | Player | Club | |
|---|---|---|---|
| March |  Popó | Vissel Kobe | |
| April | Leandro | Gamba Osaka | |
| May |  Oh Seung-Hoon | Kyoto Sanga | |
| June |  Ryohei Hayashi | Montedio Yamagata | |
| July | Koji Yamase | Kyoto Sanga | |
| August | Takashi Usami | Gamba Osaka | |
| September | Keijiro Ogawa | Vissel Kobe | |
| October | Kempes | JEF United Chiba | |
| November |
Piakai Henkel
