Horsham Riverside is an electoral division of West Sussex in the United Kingdom and returns one member to sit on West Sussex County Council.
There was a revision of electoral division boundaries in West Sussex in 2009.
The by-election took place on 22 May 2025.
The election took place on 6 May 2021.
The election took place on 4 May 2017.
The election took place on 2 May 2013.
The election took place on 4 June 2009.
There was a revision of electoral division boundaries in West Sussex in 2005.
The election took place on 5 May 2005.