Fourth Dimension is a 1973 BBC Records release featuring recordings created by the BBC Radiophonic Workshop composer Paddy Kingsland.

It features theme tunes used by BBC radio and television.

The music prominently features VCS 3 and "Delaware" Synthi 100 synthesisers, both from Electronic Music Studios (London) Ltd, with a standard rock-based session band providing backing.

The track "Reg" featured as the B-side to the 1973 single release of the Doctor Who theme.

It was reissued as part of the Record Store Day exclusive 6-CD box set Four Albums 1968 - 1978[1][2] 29 August 2020.