1984 North Hertfordshire District Council election

The 1984 North Hertfordshire District Council election was held on 3 May 1984, at the same time as other local elections across England and Scotland. There were 17 out of 50 seats on North Hertfordshire District Council up for election, being the usual third of the council.

The Conservatives remained in overall control of the council, increasing their majority by one seat. Labour lost three seats, despite its share of the vote actually increasing compared to the 1983 election. The Labour group leader, Ian Mantle, was one of those who lost his seat.

Overall results
The overall results were as follows:

Liberal and SDP votes are counted together in the summary above as part of the Alliance. In the ward results below, where the individual party affiliation of Alliance candidates was reported it is shown instead.

Ward results
The results for each ward were as follows. An asterisk(*) indicates a sitting councillor standing for re-election.

Changes 1984–1986
Two by-elections were held on 28 March 1985. The by-election in Cadwell ward was triggered by the death of independent councillor Ron Lodge, and the by-election in Letchworth South West ward was triggered by the resignation of Conservative councillor John Talbot. The SDP–Liberal Alliance won the Letchworth South West seat from the Conservatives. In Cadwell ward the Conservatives won the seat which had previously been independent.