Major-General Sir Henry Johnson, 1st Baronet, GCB (1 January 1748 – 18 March 1835) was an Anglo-Irish general in the British Army.

John became major in the 28th in 1775, went to North America, and was posted by Sir William Howe to one of the provisional battalions of light infantry, which he commanded in the American Revolutionary War campaigns of 1776–8.

During the rebellion in that year he was detached with three thousand men to occupy New Ross, and defeated the rebels when they attacked the place on 5 June 1798.

He died on 18 March 1835, at the age of eighty-seven, at Bath, where there is a monument erected by The Ancient and Most Benevolent Order of The Friendly Brothers of Saint Patrick to him in the Abbey Church.

Their eldest son, Henry Allen Johnson (1785–1860), who matriculated at Christ Church, Oxford in 1804. and was a student of the college to 1817,[6] and afterwards aide-de-camp to the Prince of Orange, succeeded as second baronet.