Thomas Salmon (1648–1706) was an English cleric and writer on music.
He was the son of Thomas Salmon of Hackney. He entered Trinity College, Oxford, on 8 April 1664, and graduated B.A. 1667, and M.A. 1670. At the university he mainly studied mathematics; Matthew Locke says that Salmon applied to him for instruction in musical composition. Locke disclaimed competence, referring Salmon to the Compendium of Practical Musick by Christopher Simpson, and suggested John Birchensha as a teacher.
In 1673 Salmon obtained the living of Meppershall in Bedfordshire, He was also rector of the Church of St Katherine in Ickleford, Hertfordshire.
Salmon gave, in July 1705, a lecture to the Royal Society on just intonation with illustrative performances by the brothers Frederick and Christian Steffkin, on viols, and Gasperini. On 4 December he wrote to Sir Hans Sloane concerning Greek enharmonic music. Further correspondence sought a patron for musical experimentation.
Salmon died at Meppershall, and was buried in the church on 1 August 1706.
Salmon in 1672 published an Essay to the Advancement of Musick proposing the disuse of the Guidonian hand and its nomenclature, and the substitution of the plain first seven letters of the alphabet. Salmon proposed the modern octave system, which William Bathe had already recommended. Salmon also added a proposal to give up the tablature then used for the lute, and in all music to substitute for the clefs the letters B, M, T (bass, mean, treble), each stave having G on the lowest line.