The 2005 J.League Cup, officially the 2005 J.League Yamazaki Nabisco Cup, was the 3rd edition of Japan association football league cup tournament and the 13th edition under the current J.League Cup format.
The competition started on March 19, and finished on November 5, 2005.
Teams from the J1 took part in the tournament.
Yokohama F. Marinos and Júbilo Iwata were given a bye to the quarter-final due to their qualification for the AFC Champions League.
The group winners of each group qualifies for the quarter-final along with the 2 best runners-up, and the two teams which qualified for the AFC Champions League.