The Men's 400 metre freestyle competition of the 2026 European Aquatics Championships was held on 16 August 2026.

Records Prior to the competition, the existing world, European and championship records were as follows. Time Swimmer Location Date World record 3:39.96 Stockholm 12 April 2025 European record Championship record 3:42.50 Rome 17 August 2022

Results Heats The heats were started on 16 August at 09:55. Qualification Rules:The 8 fastest from the heats qualify to the finals

Rank Heat Lane Swimmer Country Time Notes 1 6 4 3:45.22 Q 2 5 6 3:45.32 Q 3 7 6 3:45.78 Q 4 7 2 3:45.85 Q 5 6 6 3:46.14 Q 6 6 1 3:46.17 Q 7 7 3 3:46.28 Q 8 7 4 3:46.33 Q 9 6 7 3:46.68 10 5 1 3:46.98 11 6 3 3:47.58 12 7 5 3:47.86 13 5 5 3:47.96 14 5 4 3:48.10 15 6 0 3:48.13 16 6 0 3:48.57 17 6 5 3:48.68 18 7 7 Neutral Athletes B 3:48.90 19 7 8 3:49.11 20 5 2 3:49.14 21 7 1 3:49.29 22 5 8 3:49.51 23 6 2 3:49.52 24 5 3 3:50.39 25 4 5 3:50.94 26 4 7 3:52.01 27 5 7 3:52.43 28 3 5 3:53.24 29 3 1 3:53.51 30 5 0 3:53.64 31 4 4 3:53.82 32 7 9 3:54.66 33 3 2 3:55.36 34 3 4 3:55.78 35 4 2 3:55.90 36 6 9 3:56.12 37 4 1 3:56.13 38 3 3 3:56.27 39 3 8 3:56.93 40 3 9 3:57.35 41 5 9 3:57.93 42 4 0 3:58.01 43 2 3 3:58.43 44 2 6 3:58.52 45 3 6 3:59.35 46 2 5 4:00.31 47 2 2 4:00.57 48 3 7 4:00.73 49 2 4 4:04.05 50 2 1 4:04.39 51 1 3 4:06.50 52 3 0 4:07.38 53 2 8 4:10.62 54 1 4 4:13.49 55 1 5 4:14.80 2 7 Did not start 4 3 4 6 4 8 4 9 6 8

Final The final was held on the evening of 16 August.

Rank Lane Name Nationality Time Notes 6 3:43.14 NR 5 3:44.46 8 3:44.57 4 3 3:44.64 5 4 3:45.16 6 7 3:46.99 7 2 3:47.19 8 1 3:47.42

References