| ACN Championship | |
| Location: | Miki, Hyōgo, Japan |
| Establishment: | 1969 |
| Course: | Miki Golf Club |
| Par: | 70 |
| Yardage: | 7163yd |
| Org: | Japan Golf Association Asia-Pacific Golf Confederation Mitsubishi Corporation |
| Tour: | Japan Golf Tour Asian Tour |
| Format: | Stroke play |
| Month Played: | October |
| Aggregate: | 264 Takumi Kanaya (2024) 264 Ryu Hyun-woo (2024) |
| To-Par: | −26 Brandt Jobe (1995) |
| Current Champion: |  Takumi Kanaya |
| Map: | Japan#Japan Hyogo Prefecture |
| Map Label: | Miki GC |
| Map Relief: | yes |
| Map Size: | 200 |
| Coordinates: | 34.813°N 135.044°W |
The is a professional golf tournament on the Japan Golf Tour. Founded in 1969, the event has been hosted at different courses throughout Japan, including on all four major islands. In 2022, the purse was ¥100,000,000, with ¥20,000,000 going to the winner. From 2014 to 2019 the tournament was co-sanctioned by the Asian Tour.
| Year | Tour(s) | Winner | Score | To par | Margin of victory | Runner(s)-up | ||
|---|---|---|---|---|---|---|---|---|
| ACN Championship | ||||||||
| 2024 | 264 | −20 | Playoff | |||||
| 2023 | 271 | −17 | Playoff | |||||
| Asia Pacific Open Golf Championship Diamond Cup | ||||||||
| 2022 | 272 | −8 | 1 stroke | Hiroshi Iwata Yuto Katsuragawa Kaito Onishi Kosuke Suzuki (a) | ||||
| Asia-Pacific Diamond Cup Golf | ||||||||
| 2021 | 275 | −13 | 4 strokes | |||||
| 2020 | ASA, JPN | Cancelled due to the COVID-19 pandemic | [1] | |||||
| 2019 | 281 | −3 | 1 stroke |  Micah Lauren Shin Ren Yonezawa (a) | ||||
| 2018 | 269 | −15 | 6 strokes |  Justin Harding | ||||
| 2017 | 272 | −12 | 2 strokes |  Poom Saksansin Tadahiro Takayama | ||||
| 2016 | 270 | −10 | 2 strokes | Ippei Koike | ||||
| 2015 |  Kim Kyung-tae (2) | 271 | −9 | 3 strokes | Yuta Ikeda Toshinori Muto | |||
| 2014 | 278 | −6 | 2 strokes | Kiradech Aphibarnrat Hur Suk-ho Jason Knutzon | ||||
| Diamond Cup Golf | ||||||||
| 2013 | 279 | −9 | 2 strokes |  Brad Kennedy Kim Hyung-sung Park Sung-joon | ||||
| 2012 | 274 | −14 | 3 strokes | Kiradech Aphibarnrat | ||||
| 2011 | 272 | −16 | 4 strokes | Toshinori Muto Kaname Yokoo | ||||
| 2010 | 272 | −16 | 2 strokes | Koumei Oda | ||||
| Mitsubishi Diamond Cup Golf | ||||||||
| 2009 | 283 | −5 | Playoff | Brendan Jones | ||||
| 2008 | 274 | −10 | 1 stroke | Shintaro Kai | ||||
| 2007 | Tetsuji Hiratsuka (2) | 282 | −2 | 1 stroke | Satoru Hirota Kiyoshi Miyazato | |||
| 2006 | 275 | −9 | 2 strokes | Nozomi Kawahara Toru Suzuki | ||||
| 2005 | 275 | −5 | 3 strokes | Shingo Katayama Ryoken Kawagishi | ||||
| 2004 | 275 | −13 | 5 strokes | Hidemasa Hoshino | ||||
| Diamond Cup Tournament | ||||||||
| 2003 | 276 | −12 | 3 strokes | Steven Conran | ||||
| 2002 | Tsuneyuki Nakajima (4) | 269 | −19 | 2 stokes | Tomohiro Kondo Hirofumi Miyase Christian Peña | |||
| 2001 | 277 | −11 | Playoff | Hiroyuki Fujita Yuji Igarashi | ||||
| Mitsubishi Motors Tournament | ||||||||
| 2000 | 276 | −8 | Playoff | Toru Taniguchi | ||||
| 1999 | 268 | −16 | Playoff | Kazuhiko Hosokawa | ||||
| Mitsubishi Galant Tournament | ||||||||
| 1998 | 268 | −16 | 1 stroke | Kazuhiko Hosokawa | ||||
| 1997 | Masashi Ozaki (2) | 278 | −10 | 2 strokes | Satoshi Higashi Kōki Idoki Tōru Nakamura | |||
| 1996 | 279 | −9 | Playoff | Todd Hamilton | ||||
| 1995 | 266 | −26 | 6 strokes | Masahiro Kuramoto | ||||
| 1994 | 205 | −11 | 6 strokes | Tsuneyuki Nakajima | ||||
| 1993 | 277 | −11 | 4 strokes | Brian Jones Yoshi Mizumaki Tateo Ozaki | ||||
| 1992 | Isao Aoki (2) | 277 | −11 | 4 strokes |  Chen Tze-chung Saburo Fujiki | |||
| 1991 | 280 | −8 | 1 stroke | Isao Aoki Tsuneyuki Nakajima | ||||
| 1990 | 289 | +1 | 3 strokes | Masashi Ozaki Teruo Sugihara Tsuyoshi Yoneyama | ||||
| 1989 | 284 | −4 | 2 strokes | Masanobu Kimura | ||||
| 1988 | Brian Jones (3) | 271 | −17 | Playoff | Naomichi Ozaki | |||
| 1987 | Brian Jones (2) | 283 | −5 | 3 strokes | Nobuo Serizawa Koichi Suzuki | |||
| 1986 | Tsuneyuki Nakajima (3) | 280 | −8 | 1 stroke | Chen Tze-ming | |||
| 1985 | 272 | −12 | Playoff | Nobumitsu Yuhara | ||||
| 1984 | Haruo Yasuda (2) | 275 | −13 | 4 strokes | Kouichi Inoue Yoshitaka Yamamoto | [2] | ||
| 1983 | Tsuneyuki Nakajima (2) | 278 | −10 | 6 strokes | Lu Hsi-chuen | |||
| 1982 | Graham Marsh (3) | 271 | −13 | Playoff | Teruo Sugihara | |||
| 1981 | 289 | +1 | Playoff | Tōru Nakamura Teruo Sugihara | ||||
| 1980 | 276 | −12 | 4 strokes | Yoshihisa Iwashita Graham Marsh | ||||
| 1979 | Tōru Nakamura (2) | 285 | −3 | 1 stroke | Yoshio Kusayanagi | |||
| 1978 | 280 | −8 | 1 stroke | Hsu Sheng-san Norio Suzuki | [3] | |||
| 1977 | 277 | −11 | 3 strokes | Takaaki Kono Graham Marsh Teruo Sugihara | ||||
| Dunlop Tournament | ||||||||
| 1976 | 274 | −14 | 2 strokes | Isao Aoki | ||||
| 1975 | 278 | −10 | 2 strokes |  Mya Aye | ||||
| 1974 | Graham Marsh (2) | 272 | −16 | 3 strokes | Masashi Ozaki Teruo Sugihara | |||
| 1973 | 280 | −8 | 4 strokes | Masashi Ozaki | ||||
| 1972 | 271 | −17 | 5 strokes |  Ben Arda | ||||
| 1971 | 280 | −8 | 1 stroke | Haruo Yasuda | ||||
| 1970 | 137 | −7 | 2 strokes | Fujio Ishii Takashi Murakami | [4] | |||
| 1969 | ||||||||