List of British champions in 100 metres

The British 100 metres athletics champions covers four competitions;
 * the current British Athletics Championships which was founded in 2007,
 * the preceding AAA Championships (1880-2006),
 * the Amateur Athletic Club Championships (1866-1879) and finally
 * the UK Athletics Championships which existed from 1977 until 1997 and ran concurrently with the AAA Championships.

The AAA Championships were open to international athletes but those athletes were not considered the National Champion in this list if they won the relevant Championship, with the highest ranking British athlete given that title.

* nc= no championship held