Dina St Johnston (née Aldrina Nia Vaughan, 20 September 1930 – 30 June/1 July 2007) was a British computer programmer credited with founding the UK's first software house in 1959.

[1][2] Born Aldrina Nia Vaughan in south London, St Johnston was educated at Selhurst Grammar School for Girls before leaving school at 16 or 17 (accounts vary) to work for the British Non-Ferrous Metals Research Association.

[3] In 1953, St Johnston left the British Non-Ferrous Metals Research Association and joined Borehamwood Laboratories of Elliott Brothers (London) Ltd, where she worked in the Theory Division.

[3] Shortly after her marriage to Andrew St Johnston – head of the Elliott computing department – in 1958, St Johnston (born Vaughan) founded Vaughan Programming Services (VPS) in Ware, Hertfordshire in 1959, performing software contracts, training and hiring additional programmers as needed.

[1][7][6][8] In 1996, Vaughan Systems and Programming was sold to Harmon Industries, an American railway signalling company.