| March | |
| 19 | 3 Best albums release at once "The Best of L'Arc-en-Ciel 1994-1998" "The Best of L'Arc-en-Ciel 1998-2000" "The Best of L'Arc-en-Ciel c/w" |
| June | |
| 25 | Akasaka Zero day （Akasaka BLITZ） / LE-CIEL member limited premier live |
| 28 | Live "Shibuya Seven days 2003" starts at Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan |
| 29 | Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan |
| July | |
| 01 | Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan |
| 02 | Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan |
| 04 | Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan |
| 05 | Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan |
| 06 | Kokuritsu Yoyogi Kyogijo Daiichi Taiikukan First in the world to stream live coverage on "FOMA"（Docomo 3G Mobile Service） （87,035 people / Tickets SOLD OUT in 3 minutes!) |
| August | |
| 20 | Photo book "Seven Days-Shibuya Seven days 2003 Document Photographs-" release |
