John Garth (1721 – 1810) was an English composer, born in Harperley, near Witton-le-Wear, Co. Durham.

Little else is known of his early life, but in September 1745 and August 1746 he promoted concerts in Stockton. In the latter year he was living in Durham city, where he organised a concert series until 1772, selling tickets from his house, first in Sadler Street, thereafter in North Bailey, where he lived until after 1791. It appears that the Durham concerts were in alternate weeks to those organized by his friend Charles Avison in Newcastle, where Garth played the cello. Garth's fame spread and he taught music to leading families in the region, as well as giving organ recitals.

Garth is chiefly remembered for his eight-volume edition with English text of The First Fifty Psalms Set to Music by Benedetto Marcello (1757–65). He also composed a set of cello concertos (op. 1, 1760) and five sets of harpsichord sonatas (opp. 2, 4–7, 1768–82), among other works.

User-contributed text is available under the Creative Commons By-SA License and may also be available under the GNU FDL.