John Morgan (18 February 1742 – 27 June 1792) was a Welsh politician who sat in the House of Commons from 1769 to 1792.

He entered the House of Commons in 1769 as Member of Parliament for Brecon, succeeding his brother Charles Morgan.

In 1771, he accepted the Stewardship of the Manor of East Hendred in order to enter the by-election at Monmouthshire, replacing his late brother Thomas Morgan.

[1] Unusually, given the immense Morgan influence in Brecknockshire and Monmouthshire, the election was contested, albeit unsuccessfully, by Valentine Morris.

Finding himself in urgent need of an heir, he married Louisa Pym Burt, a woman who was more than twenty-five years his junior.