| QP | CP | Country | Athlete |
PB |
SB | Status | Details |
| 1 | 1 | Great Britain & N.I. | Matthew Hudson-Smith |
43.44 |
44.09 | Qualified by Entry Standard | 44.09 - Stade Charléty, Paris (FRA) - 28 JUN 2026 |
| 2 | 1 | France | Samuel Vessat |
44.24 |
44.24 | Qualified by Entry Standard | 44.24 - Stadium Municipal, Albi (FRA) - 26 JUL 2026 |
| 3 | 1 | Italy | Edoardo Scotti |
44.45 |
44.96 | Qualified by Entry Standard | 44.45 - National Stadium, Tokyo (JPN) - 14 SEP 2025 |
| 4 | 1 | Hungary | Attila Molnár |
44.47 |
44.47 | Qualified by Entry Standard | 44.47 - Stade Louis II, Monaco (MON) - 10 JUL 2026 |
| 5 | 2 | France | Muhammad Abdallah Kounta |
44.55 |
44.55 | Qualified by Entry Standard | 44.55 - Stadium Municipal, Albi (FRA) - 26 JUL 2026 |
| 6 | 2 | Great Britain & N.I. | Ben Jefferies |
44.66 |
44.66 | Qualified by Entry Standard | 44.66 - Alexander Stadium, Birmingham (GBR) - 21 JUN 2026 |
| 7 | 3 | Great Britain & N.I. | Charlie Dobson |
44.14 |
44.69 | Qualified by Entry Standard | 44.69 - Alexander Stadium, Birmingham (GBR) - 21 JUN 2026 |
| 8 | 1 | Netherlands | Jonas Phijffers |
44.71 |
44.72 | Qualified by Entry Standard | 44.71 - FBK Stadium, Hengelo (NED) - 03 AUG 2025 |
| 9 | 1 | Germany | Jean Paul Bredau |
44.72 |
44.72 | Qualified by Entry Standard | 44.72 - Lohrheidestadion, Wattenscheid, Bochum (GER) - 26 JUL 2026 |
| 10 | 1 | Belgium | Daniel Segers |
44.63 |
44.81 | Qualified by Entry Standard | 44.81 - Mestský Stadion, Ostrava (CZE) - 16 JUN 2026 |
| 11 | 1 | Greece | George John Franks |
44.88 |
44.88 | Qualified by Entry Standard | 44.88 - Un. of Kentucky Outdoor Track Facility, Lexington, KY (USA) - 29 MAY 2026 |
| 12 | 1 | Slovenia | Rok Ferlan |
44.70 |
45.78 | Qualified by Entry Standard | 44.91 - National Stadium, Tokyo (JPN) - 14 SEP 2025 |
| 13 | 3 | France | Yann Spillmann |
44.92 |
44.92 | Qualified by Entry Standard | 44.92 - Stadium Municipal, Albi (FRA) - 26 JUL 2026 |
| 14 | 2 | Belgium | Dylan Borlée |
44.94 |
45.49 | Qualified by Entry Standard | 44.94 - Boudewijnstadion, Bruxelles (BEL) - 22 AUG 2025 |
| 15 | 1 | Poland | Maksymilian Szwed |
44.94 |
44.94 | Qualified by Entry Standard | 44.94 - Miejski Stadion, Opole (POL) - 27 JUN 2026 |
| 16 | 3 | Belgium | Jonathan Sacoor |
44.98 |
45.03 | Qualified by Entry Standard | 45.03 - Stade Jean Delbert, Montreuil (FRA) - 17 JUN 2026 |
| 17 | 2 | Netherlands | Eugene Omalla |
45.03 |
45.03 | Qualified by Entry Standard | 45.03 - FBK Stadium, Hengelo (NED) - 21 JUN 2026 |
| 18 | 2 | Germany | Thorben Finke |
45.08 |
45.08 | Qualified by Entry Standard | 45.08 - Lohrheidestadion, Wattenscheid, Bochum (GER) - 26 JUL 2026 |
| 19 | 2 | Italy | Mohamed Soudassi |
45.10 |
45.10 | Qualified by Entry Standard | 45.10 - Stadio M.S. Cozzoli, Molfetta (ITA) - 11 JUL 2026 |
| reserve | 4 | Great Britain & N.I. | Sam Lunt |
45.16 |
45.16 | Qualified by Entry Standard | 45.16 - Boudewijnstadion, Bruxelles (BEL) - 23 MAY 2026 |
| 20 | 1 | Switzerland | Haydn Brotschi |
45.20 |
45.20 | Qualified by Entry Standard | 45.20 - Weaver Stadium, Princeton, NJ (USA) - 17 MAY 2026 |
| 21 | 1 | Romania | Mihai Sorin Dringo |
44.74 |
45.57 | Qualified by Entry Standard | 45.21 - National Stadium, Tokyo (JPN) - 14 SEP 2025 |
| 22 | 3 | Italy | Lorenzo Benati |
45.21 |
45.21 | Qualified by Entry Standard | 45.21 - Stadio Luigi Ridolfi, Firenze (ITA) - 26 JUL 2026 |
| 23 | 2 | Switzerland | Lionel Spitz |
45.01 |
45.34 | Qualified by Entry Standard | 45.24 - Kleine Allmend, Frauenfeld (SUI) - 24 AUG 2025 |
| reserve | 5 | Great Britain & N.I. | Brodie Young |
45.24 |
45.24 | Qualified by Entry Standard | 45.24 - John McDonnell Field, Fayetteville, AR (USA) - 08 MAY 2026 |
| 24 | 2 | Hungary | Patrik Simon Enyingi |
44.84 |
45.27 | Qualified by Entry Standard | 45.25 - National Stadium, Tokyo (JPN) - 14 SEP 2025 |
| reserve | 4 | Italy | Luca Sito |
44.75 |
45.39 | Qualified by World Rankings | 15th - 1210 points |
| 25 | 1 | Portugal | Omar Elkhatib |
45.42 |
45.45 | Qualified by World Rankings | 18th - 1199 points |
| 26 | 1 | Turkey | Kubilay Ençü |
45.27 |
45.27 | Qualified by World Rankings | 22nd - 1182 points |
| 27 | 1 | Ukraine | Oleksandr Pohorilko |
44.81 |
45.76 | Qualified by World Rankings | 24th - 1179 points |
| 28 | 2 | Portugal | João Coelho |
44.79 |
45.64 | Qualified by World Rankings | 31st - 1171 points |
| 29 | 3 | Portugal | Ericsson Tavares |
45.63 |
45.63 | Qualified by World Rankings | 37th - 1167 points |
| 30 | 1 | Denmark | Gustav Lundholm Nielsen |
45.41 |
45.57 | Qualified by World Rankings | 42nd - 1165 points |
| 31 | 1 | Ireland | Jack Raftery |
44.98 |
45.72 | Qualified by World Rankings | 45th - 1161 points |
| 32 | 3 | Switzerland | Ricky Petrucciani |
45.02 |
45.65 | Qualified by World Rankings | 47th - 1157 points |
| 33 | 1 | Norway | Håvard Bentdal Ingvaldsen |
44.39 |
45.86 | Qualified by World Rankings | 51st - 1153 points |
| 34 | 2 | Slovenia | Lovro Mesec Košir |
45.78 |
45.78 | Qualified by World Rankings | 58th - 1148 points |
| 35 | 1 | Spain | Ángel González |
45.53 |
45.53 | Qualified by World Rankings | 60th - 1145 points |
| 36 | 1 | Albania | Franko Burraj |
45.85 |
45.85 | Qualified by World Rankings | 70th - 1133 points |
| reserve | 2 | Norway | Andreas Grimerud |
45.90 |
46.59 | Next best by World Rankings | 76th - 1127 points |
| reserve | 2 | Ireland | Andrew Egan |
45.86 |
46.16 | Next best by World Rankings | 85th - 1122 points |
| reserve | 4 | Portugal | André Franco |
46.67 |
46.67 | Next best by World Rankings | 156th - 1079 points |