Brigadier-General Sir John Johnson, 2nd Baronet (5 November 1741 – 4 January 1830) was an American-born military officer, politician and landowner who fought as a Loyalist during the American Revolutionary War.

He was the son of Sir William Johnson, 1st Baronet, a prominent British Indian Department official in the Thirteen Colonies.

Johnson moved to the Province of Quebec during the Revolutionary War with his family and allies, as he was at risk of arrest by Patriot authorities.

He was the only son of Colonel Sir William Johnson, 1st Baronet, and his common-law wife, Catherine Weissenberg, a Palatine German immigrant.

In January 1776, nine months after the outbreak of the American Revolution, Johnson gathered several hundred armed supporters at Johnstown.

He sent a letter to Governor William Tryon, through Captain John McDonell, saying that he and his Loyalist neighbors had conferred about raising a battalion for the British cause.

Sir John's loyalty to King George III cost him his home in Johnstown and extensive property in the Mohawk Valley, all of which was confiscated after the war by the State of New York.

[7][8] In 1781, General MacLean reported that Guy Johnson's wartime accounts were "Extravagant, wonderful & fictitious, and the quality of articles so extraordinary, new & uncommon".

The exiles faced severe conditions in the early years, as they struggled to create settlements out of frontier lands, and the British were not able to get adequate supplies to them on time.

After he escaped to Canada in May 1776 at the outbreak of the American Revolutionary War, Lady Johnson was detained that year by the Whigs of New York as a hostage for the good conduct of her husband.

Together, Mary and Sir John had ten sons, eight of whom served in the British army and navy, and eight daughters, including:[13] Lady Johnson died in Montreal on August 7, 1815.