List of British champions in 400 metres hurdles

The British 400 metres hurdles athletics champions covers three competitions; the current British Athletics Championships which was founded in 2007, the preceding AAA Championships (1914-2006) and the UK Athletics Championships which existed from 1977 until 1997 and ran concurrently with the AAA Championships.

Where an international athlete won the AAA Championships the highest ranking UK athlete is considered the National Champion in this list.

Past winners

 * NBA = No British athlete in medal placings
 * nc = not contested
 * + UK Championships