Unitarians in Bath are the spiritual descendants of a group of Presbyterians who founded a meeting in 1672 in defiance of the religious laws of Charles II. The first meetings were held in Green Street and the first settled minister Christopher Taylor (appointed about 1688). The 'Frog Lane Meeting' was opened in 1692 and by 1789 was referred to as the Unitarian Chapel.

A larger chapel was built in Trim Street in 1795 and licensed for 'the worship of Almighty God by protestant dissenters of the presbyterian denomination' the year after. The passing of the Trinity Act of 1812 enabled the word 'Unitarian' to appear in legal documents and in 1820 the new chapel deed referred to the congregation's subscription to the doctrine of 'Divine Unity' (as opposed to 'Trinity in Unity'). A day school and Sunday school (for both boys and girls) were both founded in the nearby Saw Close in 1836. The chapel was restored in 1860, with a classical apse being added.

In 1796 the young radical poet Samuel Taylor Coleridge preached at the Trim Street Chapel. Henry Howse, who had substantially financed its building was a leading local philanthropist. Dr Thomas Cogan was a member of the chapel until 1810 and went on to found the Royal Humane Society. Sir Jerom Murch, who was seven times Mayor of Bath and presided over a great age of Victorian civic improvement, ministered there for fifteen years. The chapel's final minister, Rev. Sidney Spencer, was author of Mysticism in World Religion.

Since the closure of the chapel in 1972, Unitarians in Bath have met as a Fellowship. Individual members maintain the tradition of service to the community of Bath.