| Year | 
Event | 
Status | 
Participants | 
NOCs | 
| 1906 | 
400 metres Freestyle, Men | 
Intercalated | 
13 | 
7 | 
| 1908 | 
400 metres Freestyle, Men | 
Olympic | 
25 | 
10 | 
| 1912 | 
400 metres Freestyle, Men | 
Olympic | 
26 | 
13 | 
| 1920 | 
400 metres Freestyle, Men | 
Olympic | 
22 | 
11 | 
| 1924 | 
400 metres Freestyle, Men | 
Olympic | 
23 | 
13 | 
| 1928 | 
400 metres Freestyle, Men | 
Olympic | 
26 | 
17 | 
| 1932 | 
400 metres Freestyle, Men | 
Olympic | 
19 | 
10 | 
| 1936 | 
400 metres Freestyle, Men | 
Olympic | 
34 | 
16 | 
| 1948 | 
400 metres Freestyle, Men | 
Olympic | 
41 | 
21 | 
| 1952 | 
400 metres Freestyle, Men | 
Olympic | 
48 | 
29 | 
| 1956 | 
400 metres Freestyle, Men | 
Olympic | 
32 | 
19 | 
| 1960 | 
400 metres Freestyle, Men | 
Olympic | 
40 | 
25 | 
| 1964 | 
400 metres Freestyle, Men | 
Olympic | 
49 | 
27 | 
| 1968 | 
400 metres Freestyle, Men | 
Olympic | 
37 | 
20 | 
| 1972 | 
400 metres Freestyle, Men | 
Olympic | 
43 | 
28 | 
| 1976 | 
400 metres Freestyle, Men | 
Olympic | 
47 | 
29 | 
| 1980 | 
400 metres Freestyle, Men | 
Olympic | 
28 | 
16 | 
| 1984 | 
400 metres Freestyle, Men | 
Olympic | 
36 | 
25 | 
| 1988 | 
400 metres Freestyle, Men | 
Olympic | 
49 | 
33 | 
| 1992 | 
400 metres Freestyle, Men | 
Olympic | 
46 | 
31 | 
| 1996 | 
400 metres Freestyle, Men | 
Olympic | 
34 | 
30 | 
| 2000 | 
400 metres Freestyle, Men | 
Olympic | 
46 | 
40 | 
| 2004 | 
400 metres Freestyle, Men | 
Olympic | 
47 | 
39 | 
| 2008 | 
400 metres Freestyle, Men | 
Olympic | 
36 | 
26 | 
| 2012 | 
400 metres Freestyle, Men | 
Olympic | 
28 | 
23 | 
| 2016 | 
400 metres Freestyle, Men | 
Olympic | 
50 | 
39 | 
| 2020 | 
400 metres Freestyle, Men | 
Olympic | 
36 | 
31 |