Horsham Museum opened its art gallery in 2010, becoming Horsham Museum and Art Gallery. This built on a growing collection of topographical pictures acquired by gift and recently mainly by purchase. The Museum's collection of oil paintings appear on BBC Art UK website; whilst its watercolours and prints appear on the collections detailed below.

Since 1990 the Museum has actively collected works by artists that have lived in Horsham or Horsham District. Some more prominent than others. The Museum now holds the best collection in the country of Dr Geoffrey Sparrow watercolours and etching, and a growing collection of Raoul Millais works. Since the 1980s the town has a growing number of botanical artists.