USA Outdoor Track & Field Champions
Men's 400 m
| 2011 | 44.68 | Tony McQuay | Florida |
| 2010 | 44.61 | Greg Nixon | Asics |
| 2009 | 44.50 | LaShawn Merritt | Nike |
| 2008 | 44.00 | LaShawn Merritt | Nike |
| 2007 | 44.05 | Angelo Taylor | Unat |
| 2006 | 44.45 | Andrew Rock | adidas |
| 2005 | 44.20 | Jeremy Wariner | adidas |
| 2004 | 44.37 | Jeremy Wariner | Baylor |
| 2003 | 44.33 | Tyree Washington | Nike |
| 2002 | 45.00 | Angelo Taylor | Nike |
| 2001 | 45.31 | Derrick Brew | Nike |
| 2000 | 43.68 | Michael Johnson | Nike |
| 1999 | |||
| 1998 | 44.09 | Jerome Young | St. Aug's |
| 1997 | |||
| 1996 | 43.44 | Michael Johnson | Nike |
| 1995 | 43.66 | Michael Johnson | Nike |
| 1994 | 44.43 | Antonio Pettigrew | Reebok |
| 1993 | 43.74 | Michael Johnson | Nike Int |
| 1992 | 43.81 | Danny Everett | SMTC |
| 1991 | 44.36 | Antonio Pettigrew | St. Aug |
| 1990 | 44.75 | Steve Lewis | SMTC |
| 1989 | 44.27 | Antonio Pettigrew | ACC |
| 1988 | 44.92 | Tim Simon | Atl. Cst. Cl |
| 1987 | 44.46 | Butch Reynolds | Ohio St |
| 1986 | 44.47 | Darrell Robinson | Mazda |
| 1985 | 44.87 | Mark Rowe | Accusplit |
| 1984 | 45.34 | Mark Rowe | Tiger TC |
| 1983 | 45.15 | Sunder Nix | Indiana |
| 1982 | 45.05 | Cliff Wiley | Unat-KS |
| 1981 | 44.70 | Cliff Wiley | DC Inter. |
| 1980 | 45.36 | Willie Smith | Auburn TC |
| 1979 | 45.10 | Willie Smith | Ath Attic |
| 1978 | 45.15 | Maxie Parks | Athletes IA |
| 1977 | 45.44 | Robert Taylor | Phila. PC |
| 1976 | 44.82 | Maxie Parks | Maccabi TC |
| 1975 | 44.93 | Dave Jenkins | GBR |
| 45.22 | 2-Fred Newhouse | Phila. PC | |
| 1974 | 45.2 | Maurice Peoples | DC Strid |
| 1973 | 45.2 (440 yd.) | Maurice Peoples | Ariz St |
| 1972 | 45.0 | Lee Evans | BA Striders |
| 1971 | 44.5 (440 yd.) | John Smith | SC Striders |
| 1970 | 45.7 (440 yd.) | John Smith | SC Striders |
| 1969 | 45.6 (440 yd.) | Lee Evans | San Jose St |
| 1968 | 45.0 | Lee Evans | SCVYV |
| 1967 | 45.3 (440 yd.) | Lee Evans | SCVYV |
| 1966 | 45.9 (440 yd.) | Lee Evans | Unat-CA |
| 1965 | 46.1 (440 yd.) | Ollan Cassell | Unat-NJ |
| 1964 | 46.0 | Mike Larrabee | SC Striders |
| 1963 | 45.8 (440 yd.) | Ulis Williams | SC Striders |
| 1962 | 45.8 (440 yd.) | Ulis Williams | SC Striders |
| 1961 | 46.1 (440 yd.) | Otis Davis | Emerald Empire |
| 1960 | 45.8 | Otis Davis | Emerald Empire |
| 1959 | 46.1 | Eddie Southern | Texas |
| 1958 | 45.8 (440 yd.) | Eddie Southern | Texas AC |
| 1957 | 46.4 (432 yd.) | Reggie Pearman | NY Pioneer |
| 1956 | 45.8 | Tom Courtney | NYAC |
| 1955 | 46.7 (440 yd.) | Charles Jenkins | Villanova |
| 1954 | 46.6 (440 yd.) | Jim Lea | Los Angeles AC |
| 1953 | 47.1 (440 yd.) | J.W. Mashburn | Unat-OK |
| 1952 | 46.4 | Mal Whitfield | US Ar Force |
| 1951 | 46.0 | George Rhoden | Morg St/JAM |
| 1950 | 46.5 | George Rhoden | Morg St/JAM |
| 1949 | 46.4 | George Rhoden | Morg St/JAM |
| 1948 | 46.3 | Herb McKenley | Shore AC/JAM |
| 1947 | 47.1 | Herb McKenley | Ill/JAM |
| 1946 | 46.3 | Elmore Harris | Shore AC |
| 1945 | 48.4 | Herb McKenley | Unat/JAM |
| 1944 | 48.0 | Elmore Harris | Shore AC |
| 1943 | 47.7 | Cliff Bourland | Sn CalAA |
| 1942 | 46.7 | Cliff Bourland | Sn CalAA |
| 1941 | 46.0 | Grover Klemmer | SFOC |
| 1940 | 47.0 | Grover Klemmer | SFOC |
| 1939 | 48.3 | Erwin Miller | Sn Calif. AA |
| 1938 | 47.6 | Ray Malott | SF Olympic Club |
| 1937 | 47.1 | Ray Malott | SF Olympic Club |
| 1936 | 47.3 | Harold Smallwood | Sn Calif |
| 1935 | 47.6 | Eddie O'Brien | NYAC |
| 1934 | 47.4 | Ivan Fuqua | Indiana |
| 1933 | 47.7 | Ivan Fuqua | Indiana |
| 1932 | 46.9 | Bill Carr | Penn |
| 1931 | 48.8 (440 yd.) | Vic Williams | Los Angeles AC |
| 1930 | 48.8 (440 yd.) | Vic Williams | Los Angeles AC |
| 1929 | 48.4 (440 yd.) | Reggie Bowen | Pittsburgh |
| 1928 | 51.4 | Ray Barbuti | NYAC |
| 1927 | 49.6 (440 yd.) | Hermon Phillips | Illinois AC |
| 1926 | 48.6 (440 yd.) | Ken Kennedy | Illinois AC |
| 1925 | 49.2 (440 yd.) | Cecil Cooke | Salem Cres. AC |
| 1924 | 49.8 (440 yd.) | James Burgess | West Side Y |
| 1923 | 50.0 (440 yd.) | Horatio Fitch | Chicago AA |
| 1922 | 49.9 (440 yd.) | James Driscoll | Boston AA |
| 1921 | 48.6 (440 yd.) | William Stevenson | NYAC |
| 1920 | 49.0 (440 yd.) | Frank Shea | US Navy |
| 1919 | 50.2 (440 yd.) | Frank Shea | Pittsburgh AC |
| 1918 | 49.4 (440 yd.) | Corn. Shaughnessy | Fed. Rend |
| 1917 | 49.6 (440 yd.) | Frank Shea | Pittsburgh AC |
| 1916 | 49.8 (440 yd.) | Thomas Halpin | Boston AA |
| 1915 | 47.0wS (440 yd.) | Ted Meredith | Meadowbrook |
| 1914 | 50.2 (440 yd.) | Ted Meredith | Meadowbrook |
| 1913 | 51.2 (440 yd.) | Carroll Haff | Chicago AA |
| 1912 | 49.4 (440 yd.) | Thomas Halpin | Boston AA |
| 1911 | 49.0 (440 yd.) | Edward Lindberg | Chicago AA |
| 1910 | 52.0 (440 yd.) | William Hayes | St. Greg. AC |
| 1909 | 50.4 (440 yd.) | Edward Lindberg | Chicago AA |
| 1908 | 49.6 (440 yd.) | Harry Hillman | NYAC |
| 1907 | 51.0 (440 yd.) | John Taylor | Penn |
| 1906 | 50.5 (440 yd.) | Frank Waller | Milwaukee AC |
| 1905 | 49.6 (440 yd.) | Frank Waller | Milwaukee AC |
| 1904 | 51.2 (440 yd.) | D.H. Meyer | 74 Reg., NY |
| 1903 | 52.0 (440 yd.) | Harry Hillman | NYAC |
| 1902 | 50.8 (440 yd.) | Fay Moulton | NYAC |
| 1901 | 52.4 (440 yd.) | Howard Hayes | Detroit AC |
| 1900 | 52.6 (440 yd.) | Maxie Long | NYAC |
| 1899 | 50.8 (440 yd.) | Maxie Long | NYAC |
| 1898 | 52.0 (440 yd.) | Maxie Long | NYAC |
| 1897 | 49.0 (440 yd.) | Thomas Burke | Boston AA |
| 1896 | 48.8 (440 yd.) | Thomas Burke | Boston AA |
| 1895 | 49.6 (440 yd.) | Thomas Burke | Boston AA |
| 1894 | 51.0 (440 yd.) | Tom Keane | Boston AA |
| 1893 | 50.4 (440 yd.) | Edward Allen | NYAC |
| 1892 | 50.0 (440 yd.) | Walter Downs | NYAC |
| 1891 | 51.0S (440 yd.) | Walter Downs | NYAC |
| 1890 | 50.0 (440 yd.) | Walter Downs | NYAC |
| 1889 | 51.4 (440 yd.) | Walter Dohm | NYAC |
| 1888 | 51.0 (440 yd.) | Walter Dohm | NYAC |
| 1888 | 53.0 (440 yd.) | T.J. Mahoney | IRELAND |
| T.J. Norton | Manhtan AC | ||
| 1887 | 51.8 (440 yd.) | Harvey Banks | Manhattan AC |
| 1886 | 52.0 (440 yd.) | John Robertson | CAN |
| Geo. Bradish | NYAC | ||
| 1885 | 54.2 (440 yd.) | H. Mason Raborg | NYAC |
| 1884 | 55.8 (440 yd.) | Lon Myers | Manhattan AC |
| 1883 | 52 1/8 (440 yd.) | Lon Myers | Manhattan AC |
| 1882 | 51.6 (440 yd.) | Lon Myers | Manhattan AC |
| 1881 | 49.4 (440 yd.) | Lon Myers | Manhattan AC |
| 1880 | 52.0 (440 yd.) | Lon Myers | Manhattan AC |
| 1879 | 52.4 (440 yd.) | Lon Myers | Manhattan AC |
| 1878 | 54 3/8w (440 yd.) | Frank Brown | Glenwood AC |
| 1877 | 55 1/4 (440 yd.) | Edward Merritt | NYAC |
| 1876 | 54.5 (440 yd.) | Edward Merritt | NYAC |
| 1875- | Not held | ||
S - straight race course