Editing 1623 (section)

=== January&ndash;March ===
* [[January 1]]
** [[Paul Hentzner]], German lawyer and traveller in England (b. [[1558]])
** [[Christopher Heydon]], English politician (b. [[1561]])
* [[January 11]] &ndash; [[Pieter van Mierevelt]], Dutch painter (b. [[1596]])
* [[January 15]]
** [[Paolo Sarpi]], Italian theologian (b. [[1552]])
** [[Leonardus Lessius]], Flemish Jesuit theologian (b. [[1554]])
* [[February]] &ndash; Malcolm Macfie, last chief of the Scottish clan [[Clan Macfie]]
* [[February 8]] &ndash; [[Thomas Cecil, 1st Earl of Exeter]], English politician (b. [[1546]])
* [[February 19]] &ndash; [[Clara Maria of Pomerania-Barth]], German noble (b. [[1574]])
* [[March 7]] &ndash; [[Luís Mendes de Vasconcellos]], Portuguese 55th Grandmaster of the [[Knights Hospitaller]] (b. c. [[1542]])
* [[March 19]] &ndash; [[Philip Sigismund of Brunswick-Wolfenbüttel]], German Catholic bishop (b. [[1568]])
* [[March 25]] &ndash; [[Henri de La Tour d'Auvergne, Duke of Bouillon]] (b. [[1555]])<ref>{{cite book|author=Thomas Birch|title=Memoirs of the Reign of Queen Elizabeth: From the Year 1581 Till Her Death ... |publisher=Ams Press|year=1970|page=64}}</ref>
* [[March 29]] &ndash; [[Scévole de Sainte-Marthe (1536–1623)|Scévole de Sainte-Marthe]], French poet (b. [[1536]])