Editing 1777 (section)

===January–March===
* [[January 10]] &ndash; [[Spranger Barry]], Irish actor (b. [[1719]])
* [[January 12]] &ndash; [[Hugh Mercer]], [[American Revolutionary War]] officer, mortally wounded in battle (b. [[1726]])
* [[January 13]] &ndash; [[James Rait]], Anglican clergyman, Scottish Episcopal Church Bishop of Brechin 1742–1777 (b. [[1689]])
* [[January 27]] &ndash; [[Hubert de Brienne]], French naval commander (b. [[1690]])
* [[January 30]] &ndash; [[Enrichetta d'Este]], Duchess of Parma (b. [[1702]])
* [[February 9]]
** [[Captain Abraham Godwin]], American marine on [[USS Washington (1776 row galley)|USS ''Washington'' (1776 row galley)]] (b. [[1724]])
** [[Seth Pomeroy]], American gunsmith and soldier (b. [[1706]])
* [[February 11]] &ndash; [[Sir Gilbert Elliot, 3rd Baronet, of Minto]], Scottish statesman, philosopher and poet (b. [[1722]])
* [[February 24]] &ndash; King [[Joseph I of Portugal]] (b. [[1714]])
* [[February 28]] &ndash; [[Joab Hoisington]], American major (b. [[1736]])
* [[March 1]]
** [[Józef Aleksander Jabłonowski]], Polish nobleman (szlachcic) (b. [[1711]])
** [[Georg Christoph Wagenseil]], Austrian composer (b. [[1715]])
* [[March 2]] &ndash; [[Empress Xiaoshengxian]], mother of the Chinese [[Qianlong Emperor]] of China (b. [[1692]])
* [[March 4]] &ndash; [[Pierre-Herman Dosquet]], 4th bishop of Quebec (b. [[1691]])
* [[March 6]] &ndash; [[Jeremias Friedrich Reuß]], German theologian (b. [[1700]])
* [[March 10]] &ndash; [[John the Painter]], British criminal (b. [[1752]])
* [[March 20]] &ndash; [[Jean-François-Joseph de Rochechouart]], French Roman Catholic Cardinal (b. [[1708]])
* [[March 23]] &ndash; [[Sir Hugh Paterson, 2nd Baronet]], Scottish Jacobite and Member of the Parliament of Great Britain (b. [[1685]])
* [[March 31]] &ndash; [[Richard Terrick]], Church of England clergyman, Bishop of Peterborough 1757–1764 and Bishop of London 1764–1777 (b. [[1710]])