The 2003 Dacorum Borough Council election took place on 1 May 2003 to elect member to Dacorum Borough Council in Hertfordshire, England. This was on the same day as other local elections.
The whole council was up for election and the Conservatives gained overall control after previously relying on the mayor's casting vote for control. Overall turnout was 32.9%.
Incumbent councillors standing for re-election are marked with an asterisk (*). Changes in seats do not take into account by-elections or defections.