| 04 | Kirani James |  | 43.78 | | 26 ago 2015 | National Stadium, Beijing (CHN) |
| 05 | Youssef Ahmed Masrahi |  | 43.93 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 06 | Rusheen Mcdonald |  | 43.93 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 07 | Luguelín Santos |  | 44.11 | | 26 ago 2015 | National Stadium, Beijing (CHN) |
| 08 | Abdalelah Haroun |  | 44.27 | | 5 lug 2015 | La Chaux-de-Fonds (SUI) |
| 09 | Steven Gardiner |  | 44.27 | | 27 giu 2015 | Nassau (BAH) |
| 10 | Machel Cedenio |  | 44.36 | | 16 mag 2015 | George Town (CAY) |
| 11 | Deon Lendore |  | 44.41 | | 16 mag 2015 | Starkville, MS (USA) |
| 12 | David Verburg |  | 44.41 | | 26 giu 2015 | Hayward Field, Eugene, OR (USA) |
| 13 | Vernon Norwood |  | 44.44 | | 18 apr 2015 | Baton Rouge, LA (USA) |
| 14 | Martyn Rooney |  | 44.45 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 15 | Javon Francis |  | 44.50 | | 13 giu 2015 | Kingston (JAM) |
| 16 | Renny Quow |  | 44.54 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 17 | Rabah Yousif |  | 44.54 | | 24 ago 2015 | National Stadium, Beijing (CHN) |
| 18 | Christopher Brown |  | 44.54 | | 30 mag 2015 | Hayward Field, Eugene, OR (USA) |
| 19 | Lalonde Gordon |  | 44.64 | | 7 ago 2015 | San José (CRC) |
| 20 | Bryshon Nellum |  | 44.65 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 21 | Jonathan Borlée |  | 44.67 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 22 | Peter Matthews |  | 44.69 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 23 | Liemarvin Bonevacia |  | 44.72 | | 23 ago 2015 | National Stadium, Beijing (CHN) |
| 24 | Kévin Borlée |  | 44.74 | | 24 ago 2015 | National Stadium, Beijing (CHN) |
| 25 | Alphas Leken Kishoyian |  | 44.75 | | 11 lug 2015 | Nairobi (KEN) |
| 26 | Nicholas Chepseba |  | 44.75 | | 11 lug 2015 | - |
| 27 | Najee Glass |  | 44.79 | | 24 apr 2015 | Gainesville, FL (USA) |
| 28 | Nery Brenes |  | 44.80 | | 7 ago 2015 | San José (CRC) |
| 29 | Tony Mcquay |  | 44.81 | | 30 mag 2015 | Hayward Field, Eugene, OR (USA) |
| 30 | Kyle Clemons |  | 44.84 | | 23 lug 2015 | CIBC, Toronto (CAN) |
| 31 | Bralon Taplin |  | 44.89 | | 11 apr 2015 | Tempe, AZ (USA) |
| 32 | Ricardo Chambers |  | 44.93 | | 7 ago 2015 | San José (CRC) |
| 33 | Akeem Bloomfield |  | 44.93 | | 28 mar 2015 | Kingston (JAM) |
| 34 | Marcus Chambers |  | 44.95 | | 26 giu 2015 | Hayward Field, Eugene, OR (USA) |
| 35 | Orukpe Erayokan |  | 44.95 | | 14 set 2015 | Brazzaville (CGO) |
| 36 | Ashton Eaton |  | 45.00 | | 28 ago 2015 | National Stadium, Beijing (CHN) |
| 37 | Michael Mathieu |  | 45.00 | | 27 giu 2015 | Nassau (BAH) |
| 38 | Boniface Ontuga Mweresa |  | 45.01 | | 15 set 2015 | Brazzaville (CGO) |
| 39 | Vitalii Butrym |  | 45.01 | | 25 lug 2015 | Almaty (KAZ) |
| 40 | Donald Blair-Sanford |  | 45.04 | | 19 lug 2015 | Meteor, Zhukovskiy (RUS) |
| 41 | Conrad Williams |  | 45.06 | | 6 giu 2015 | Genève (SUI) |
| 42 | Gustavo Cuesta |  | 45.09 | | 7 ago 2015 | San José (CRC) |
| 43 | Jarryd Dunn |  | 45.09 | | 20 giu 2015 | Olympic Stadium, Cheboksary (RUS) |
| 44 | Matthew Hudson-Smith |  | 45.09 | | 11 giu 2015 | Bislett Stadion, Oslo (NOR) |
| 45 | Pavel Maslák |  | 45.09 | | 1 lug 2015 | Velenje (SLO) |
| 46 | Onkabetse Nkobolo |  | 45.10 | | 14 set 2015 | Brazzaville (CGO) |
| 47 | Yoandys Lescay |  | 45.13 | | 7 ago 2015 | San José (CRC) |
| 48 | Michael Berry |  | 45.13 | | 25 giu 2015 | Hayward Field, Eugene, OR (USA) |
| 49 | Jarrin Solomon |  | 45.15 | | 5 lug 2015 | La Chaux-de-Fonds (SUI) |
| 50 | Abbas Abubakar Abbas |  | 45.15 | | 25 lug 2015 | Plovdiv (BUL) |