Wikimedia Commons has media related to Countries at the 2012 Summer Olympics.
| 19th century: | 1896 • 1900 |
| 20th century: | 1904 • 1908 • 1912 • (1916) • 1920 • 1924 • 1928 • 1932 • 1936 • (1940) • (1944) • 1948 • 1952 • 1956 • 1960 • 1964 • 1968 • 1972 • 1976 • 1980 • 1984 • 1988 • 1992 • 1996 • 2000 |
| 21st century: | 2004 • 2008 • 2012 • 2016 • 2020 • 2024 • 2028 |
This category includes nations that participated in the 2012 Summer Olympics in London, Great Britain.