Heart South is a regional radio station owned and operated by Global as part of the Heart network. It broadcasts to the south and south east of England.

The station launched on 3 June 2019 as a result of a merger between four sister stations: Heart Solent, Heart Kent, Heart Sussex and Surrey and Heart Thames Valley. The station ceased on 21 February 2025.

Under relaxed OFCOM requirements for local content on commercial radio, Heart South is permitted to share all programmes between seven licences located in the ITV Meridian broadcast region.

Previously, these licences broadcast as separate stations:

Ocean Sound's West service was split off into Power FM in December 1988 - with the parent service, later known was Ocean FM continuing for the East and North areas.

In 1992, Ocean merged with Southern Sound (latterly Southern FM) to form the Southern Radio Group with the two stations largely sharing output. The company went onto purchase Invicta Radio in 1992, before being brought by Capital Radio plc in 1994.

By 2005, all seven stations entered common ownership when GWR Group merged with Capital to form GCap Media, which in turn was taken over by Global in 2008.

In 2009, six of the stations were rebranded as part of a rollout of the Heart network across 29 local radio stations owned by Global. Fox FM and 2-Ten FM relaunched in March, followed by 2CR, Invicta, Ocean FM, Southern FM. By this point, local programming had been reduced to ten hours on weekdays and four hours at weekends.