| 順位 | 記録 | | 氏名 | 所属 | 大会 | 日付 | 場所 | 開催県 | |
| 1 | 49.05 | | 小野 裕真 | 三菱自動車水島 | 第62回中国実業団選手権 | 2023/05/21 | みよし運動公園陸上競技場 | 広島 | |
| 2 | 49.20 | | 富田 悠介 | ＯＵＦ | 第77回中国選手権 | 2023/08/19 | 布勢総合運動公園陸上競技場 | 鳥取 | |
| 3 | 49.49 | | 中川 亮太 | Ｇｌｏｒｙ・ＡＣ | 第62回中国実業団選手権 | 2023/05/21 | みよし運動公園陸上競技場 | 広島 | |
| 4 | 49.64 | | 山田 泰裕 | ＯＵＦ | 第33回岡山学生選手権 | 2023/11/03 | 岡山県笠岡陸上競技場 | 岡山 | |
| 5 | 49.76 | | 藤井 一輝 | ＯＵＦ | 第77回中国選手権 | 2023/05/21 | 布勢総合運動公園陸上競技場 | 鳥取 | |
| 6 | 49.78 | | 住井 和紀 | ＯＵＦ | 第77回中国選手権 | 2023/05/21 | 布勢総合運動公園陸上競技場 | 鳥取 | |
| 7 | 49.85 | | 徳永 貴昭 | 三菱自動車水島 | 第77回中国選手権 | 2023/05/21 | 布勢総合運動公園陸上競技場 | 鳥取 | |
| 8 | 50.29 | | 北 優也 | 三菱自動車水島 | 第4回倉敷記録会 | 2023/03/25 | 倉敷運動公園陸上競技場 | 岡山 | |
| 9 | 50.74 | | 那須 宣行 | Ｇｌｏｒｙ・ＡＣ | 第71回岡山市三部対抗競技会 | 2023/04/29 | 岡山県陸上競技場 | 岡山 | |
| 10 | 51.39 | | 小郷 基光 | 岡山ＡＣ | 第65回岡山県実業団対抗選手権 | 2023/04/23 | 岡山県笠岡陸上競技場 | 岡山 | |
| 11 | 51.67 | | 小泉 健 | 岡山市消防局 | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 12 | 51.68 | | 河田 晋一郎 | 三菱自動車水島 | 第1回広島県北部記録会 | 2023/06/10 | みよし運動公園陸上競技場 | 広島 | |
| 13 | 51.95 | | 河本 祐偉斗 | 三菱自動車水島 | 第3回岡山県記録会 | 2023/09/10 | 岡山県陸上競技場 | 岡山 | |
| 14 | 52.35 | | 高橋 輝 | 三菱自動車水島 | 第4回倉敷記録会 | 2023/03/25 | 倉敷運動公園陸上競技場 | 岡山 | |
| 15 | 52.52 | | 大屋 唯人 | 三菱自動車水島 | 第4回倉敷記録会 | 2023/03/25 | 倉敷運動公園陸上競技場 | 岡山 | |
| 16 | 52.62 | | 坪井 直紀 | Ｇｌｏｒｙ・ＡＣ | 第17回岡山カーニバル | 2023/10/21 | 岡山県陸上競技場 | 岡山 | |
| 17 | 53.19 | | 廣瀬 正弥 | ＯＵＦ | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 18 | 53.34 | | 尾崎 泰成 | Ｇｌｏｒｙ・ＡＣ | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 19 | 53.65 | | 安延 瑞喜 | Ｇｌｏｒｙ・ＡＣ | 第17回岡山カーニバル | 2023/10/21 | 岡山県陸上競技場 | 岡山 | |
| 20 | 53.71 | | 今井 智稀 | 三菱自動車水島 | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 21 | 53.78 | | 白井 悠真 | ＯＵＦ | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 22 | 54.25 | | 森 海都 | ＯＵＦ | 第17回岡山カーニバル | 2023/10/21 | 岡山県陸上競技場 | 岡山 | |
| 23 | 55.48 | | 片山 和也 | 烏城塗装工業 | 第10回木南道孝記念競技会 | 2023/05/06 | ヤンマースタジアム長居 | 大阪 | |
| 24 | 56.63 | | 藤本 恭平 | 岡山ＡＣ | 第17回岡山カーニバル | 2023/10/21 | 岡山県陸上競技場 | 岡山 | |
| 25 | 57.40 | | 石川 優希 | Ｇｌｏｒｙ・ＡＣ | 第66回鳥取市選手権 | 2023/06/11 | 布勢総合運動公園陸上競技場 | 鳥取 | |
| 26 | 58.18 | | 杉香 紀彦 | 岡山ＡＣ | 第34回岡山市陸上競技選手権大会 | 2023/07/30 | 岡山県陸上競技場 | 岡山 | |
| 27 | 59.82 | | 大森 蓮 | 岡山市消防局 | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 28 | 1.00.23 | | 河部 サトシ | ＫＮＤ・ＴＣ | 第65回岡山県実業団対抗選手権 | 2023/04/23 | 岡山県笠岡陸上競技場 | 岡山 | |
| 29 | 1.00.54 | | 長崎 智 | 岡山市消防局 | 第65回岡山県実業団対抗選手権 | 2023/04/23 | 岡山県笠岡陸上競技場 | 岡山 | |
| 30 | 1.01.43 | | 三秋 欣彦 | 岡山ＡＣ | 第69回岡山県選手権 | 2023/06/24 | 岡山県陸上競技場 | 岡山 | |
| 31 | 1.01.86 | | 小郷 勇太 | 岡山市消防局 | 第3回岡山県記録会 | 2023/09/10 | 岡山県陸上競技場 | 岡山 | |
| 32 | 1.07.56 | | 古川 勝博 | 岡山商大ＡＣ | 第69回岡山県選手権 | 2023/06/23 | 岡山県陸上競技場 | 岡山 | |
| 33 | 1.08.36 | | 鈴木 茂正 | 岡山教員クラブ | 第69回岡山県選手権 | 2023/06/23 | 岡山県陸上競技場 | 岡山 | |
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