Geoffrey Alan Blyth (27 July 1929 – 14 August 2007) was an English music critic, author, and musicologist who was particularly known for his writings within the field of opera. He was a specialist on singers and singing. Born in London, Blyth's earliest musical experiences were at Rugby School. He attended the music lectures of Professor Jack Westrup. After graduation from Pembroke College, Oxford, where he read history, he returned to London and worked in journalism and publishing. He wrote reviews, interviews and obituaries for The Times and for Gramophone. He was a long-time contributor to the British magazine Opera.
- "Alan Blyth". The Guardian. 31 January 2018. Retrieved 22 August 2021.
- "Alan Blyth: An interview with Heinz Holliger". The Gramophone. 1 November 2014. Retrieved 22 August 2021.
- C. Mackenzie. "Tribute: Alan Blyth", The Gramophone (2007), volume 85, issues 1024–1026, page 10.