(D)：Difending Champion
| Date | Championships | Course | Venue | Champion | |
| 4/20 – 4/23 | 2000 Asia-Pacific Open Golf Championship Kirin Open Golf | Ibaraki Golf Club East Course | IBARAKI | Shingo Katayama | |
| 6/22 – 6/25 |  |
33rd 2000 Japan Women’s Open Golf Championship | Hanno Golf Club | SAITAMA | Kaori Higo |
| 7/4 – 7/8 | 85th 2000 Japan Amateur Golf Championship | Katayamazu Golf Club Hakusan Course | ISHIKAWA | Hiroshi Wada | |
| 8/1 – 8/4 | 54th 2000 Japan Collegiate Golf Championship | Sagamihara Golf Club West Course | KANAGAWA | Yusaku Miyazato | |
| 8/2 – 8/4 | 37th 2000 Japan Women’s Collegiate Golf Championship | Sagamihara Golf Club West Course | KANAGAWA | Yoko Yonemura | |
| 8/16 – 8/18 | 6th 2000 Japan Junior Golf Championship Boy’s 15-17 Division | Kasumigaseki Country Club West Course | SAITAMA | Kodai Ichihara | |
| 8/17 – 8/18 | 6th 2000 Japan Junior Golf Championship Boy’s 12-14 Division | Kasumigaseki Country Club East Course | SAITAMA | Fumio Matsumoto | |
| 8/17 – 8/18 | 6th 2000 Japan Junior Golf Championship Girl’s 15-17 Division | Kasumigaseki Country Club East Course | SAITAMA | Ayaka Shigaki | |
| 8/17 – 8/18 | 6th 2000 Japan Junior Golf Championship Girl’s 12-14 Division | Kasumigaseki Country Club East Course | SAITAMA | Shinobu Moromizato | |
| 9/6 – 9/8 | 22nd 2000 Japan Senior Golf Championship | Rainbow Hill’s Golf Club | MIYAGI | Makiei Bito | |
| 10/3 – 10/7 | 42nd 2000 Japan Women’s Amateur Golf Championship | Kamo Country Club | HIROSHIMA | Ayaka Shigaki | |
| 10/12 – 10/15 | |
65th 2000 Japan Open Golf Championship | Takanodai Country Club | CHIBA | Naomichi Ozaki |
| 10/19 – 10/20 | 8th 2000 Japan Women’s Senior Golf Championship | Kanra Country Club | GUNMA | Keiko Watanabe | |
| 10/26 – 10/29 | |
10th 2000 Japan Senior Open Golf Championship | Kasugai Country Club East Course | AICHI | Katsunari Takahashi |
| 11/1 – 11/2 | 7th 2000 Japan Mid-Senior Golf Championship | Rifu Golf Club | MIYAGI | Hideya Yamamoto | |
| 11/1 – 11/2 | 7th 2000 Japan Grand-Senior Golf Championship | Rifu Golf Club | MIYAGI | Shoichi Yajima | |
| 11/8 – 11/10 | 5th 2000 Japan Mid-Amateur Golf Championship | Mizobe Country Club | KAGOSHIMA | Hideo Kawabe | |
| 11/9 – 11/10 | 5th 2000 Japan Women’s Mid-Amateur Golf Championship | Sengari Country Club | HYOGO | Mari Nagumo | |