Carl Olof Cronstedt

Vice admiral Carl Olof Cronstedt
Miniature by Jacob Axel Gillberg
Birth name	Carl Olof Cronstedt
Born	(1756-10-03)3 October 1756 Botby mansion, Finland
Died	7 April 1820(1820-04-07) (aged 63) Hertonäs, Finland
Allegiance	Sweden Great Britain
Service/branch	Swedish Royal Navy Royal Navy
Years of service	1765–1808
Rank	Vice admiral
Commands	Fleet of the Army Sveaborg Garrison
Battles/wars	American Revolutionary War Russo-Swedish War (1788–1790) Battle of Svensksund Finnish War Siege of Sveaborg
Awards	Commander with the Great Cross of the Order of the Sword Knight with the Great Cross of the Order of the Sword
Relations	Johan Gabriel Cronstedt (father) Hedvig Juliana Jägerhorn af Spurila (mother)

Carl Olof Cronstedt the elder (3 October 1756 – 7 April 1820) was a Swedish naval commander responsible for the overwhelming Swedish victory at the Second Battle of Svensksund, one of the largest naval battles in the history of the Baltic Sea. He is often better remembered, however, as the commander of the fortress of Sveaborg (Finnish: Suomenlinna) during the Finnish War in 1808–09, which was fought between Sweden and Imperial Russia, and ended in Cronstedt surrendering the fortress.