2017 J1 League
The 2017 J1 League was the 25th season of the J1 League, the top Japanese professional league for association football clubs, since its establishment in 1993. The season began on 25 February 2017 and ended on 2 December. Fixtures for the 2017 season were announced on 26 January 2017.
Kashima Antlers were the defending champions. Consadole Sapporo, Shimizu S-Pulse and Cerezo Osaka entered as the three promoted teams from the 2016 J2 League.
The league was won by Kawasaki Frontale, winning their first major title while in J1, and 40 years after their first season in the Japanese top division.
Clubs
A total of 18 clubs will contest the league, including 15 sides from the 2016 season and three promoted from the 2016 J2 League. This will include the two top teams; Consadole Sapporo and Shimizu S-Pulse from the J2 League, and the winners of the play-offs; Cerezo Osaka.The three promoted clubs replace Nagoya Grampus, Shonan Bellmare and Avispa Fukuoka. Former J1 League champion Nagoya Grampus were relegated to the J2 League for the first time in their history.
Stadiums and locations
Personnel and kits
Managerial changes
Foreign players
The total number of foreign players is restricted to five per club. For matchday squad registration, a club can register up to four foreign players, but a maximum of three can be from outside the AFC. Players from J.League partner nations are exempt from these club registration and matchday squad registration restrictions.Players name in bold indicates the player is registered during the summer transfer window.
| Club | Player 1 | Player 2 | Player 3 | Player 4 | Player 5 | Other | Former |
| Albirex Niigata |  Douglas Tanque | Roni | Thiago Galhardo |  Romero Frank |  Song Ju-hun | Jean Patrick | |
| Bueno | Leandro Moura | Léo Silva | Pedro Júnior | Kwoun Sun-tae | |||
| Omiya Ardija | Cauê Cecilio | Marcelo Toscano | Mateus | Kim Dongsu |  Dragan Mrđa  Nejc Pecnik | ||
| Cerezo Osaka | Ricardo Santos | Souza |  Matej Jonjić | Ahn Joon-soo | Kim Jin-hyeon | ||
| Consadole Sapporo | Macedo | Reis |  Jay Bothroyd | Gu Sung-yun | Kim Min-tae |  Chanathip Songkrasin | Julinho |
 Miloš Degenek |  Quenten Martinus |  David Babunski |  Hugo Vieira | Park Jeong-su |  Ippey Sinodzuka | ||
| Eduardo | Eduardo Neto | Elsinho | Rhayner | Jung Sung-ryong |  Jefferson Tabinas | ||
| Gamba Osaka | Ademilson | Fabio | Hwang Ui-jo | Oh Jae-suk | Bae Soo-yong | Kim Jung-ya | |
| Júbilo Iwata | Adaílton |  Krzysztof Kaminski |  Fozil Musaev | ||||
| Maurício Antônio | Rafael Silva | Zlatan Ljubijankič | |||||
| Cristiano | Diego Oliveira | Ramon Lopes | Kim Bo-kyung | Yun Suk-young | Dudu | ||
| Sagan Tosu |  Víctor Ibarbo | An Yong-woo | Cho Dong-geon | Jeong Seung-hyun | Kim Min-hyeok |  Franco Sbuttoni | |
| Sanfrecce Hiroshima | Anderson Lopes | Felipe | Patric | Mihael Mikić | Nathan Burns | ||
| Shimizu S-Pulse | Mitchell Duke | Freire | Kanu | Tiago Alves |  Jong Tae-se | Byeon Jun-byum | |
| Lipe Veloso |  Peter Utaka | Jang Hyun-soo | Yu In-soo | Jakkit Wechpirom | Nathan Burns | ||
| Ventforet Kofu | Billy Konstantinidis | Dudu | Éder Lima | Lins | Gabriel Rodrigues Junior Barros Wilson Oliver Bozanic | ||
| Vegalta Sendai | Crislan | Vinícius | Lee Yunoh | Ryang Yong-gi | Pablo Diogo | ||
| Vissel Kobe | Leandro | Nílton | Wescley |  Lukas Podolski | Kim Seung-gyu |
Results
League table
Positions by round
Results table
Season statistics
Top scorers
As of matches played on December 2nd, 2017.| Rank | Player | Club | Goals |
| 1 |  Yū Kobayashi | Kawasaki Frontale | 23 |
| 2 | Kenyu Sugimoto | Cerezo Osaka | 22 |
| 3 | Shinzo Koroki | Urawa Red Diamonds | 20 |
| 4 | Kengo Kawamata | Júbilo Iwata | 14 |
| 5 | Mu Kanazaki | Kashima Antlers | 12 |
| 5 | Rafael Silva | Urawa Red Diamonds | 12 |
| 5 | Cristiano | Kashiwa Reysol | 12 |
| 8 | Leandro | Kashima Antlers | 11 |
Top assists
As of matches played on December 2nd, 2017.| Rank | Player | Club | Assists |
| 1 | Kengo Nakamura | Kawasaki Frontale | 12 |
| 2 | Cristiano | Kashiwa Reysol | 10 |
| 2 | Yusuke Maruhashi | Cerezo Osaka | 10 |
| 4 | Yōsuke Kashiwagi | Urawa Red Diamonds | 9 |
| 4 | Shintaro Kurumaya | Kawasaki Frontale | 9 |
| 4 | Kota Mizunuma | Cerezo Osaka | 9 |
| 4 | Kosuke Ota | FC Tokyo | 9 |
| 8 | Yū Kobayashi | Kawasaki Frontale | 8 |
| 8 | Shunsuke Nakamura | Júbilo Iwata | 8 |
| 8 | Manabu Saitō | Yokohama F. Marinos | 8 |
| - | - | - | 8 |
| - | - | - | 8 |
Hat-tricks
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