The 1999 Horsham District Council election took place on 6 May 1999 to elect members of Horsham District Council in England. It was held on the same day as other local elections. The Conservatives won a majority of 3 on the council, gaining from the Liberal Democrats.
Prior to the election, the composition of the council was:
After the election, the composition of the council was:
Brain J. Ms. was elected in Storrington as a Liberal Democrat in 1995, when this seat was last contested.