Carl Johan Adlercreutz (27 April 1757 – 21 August 1815) was a Swedish (Finnish) general and statesman, born in Borgå, Finland on family estates.

Entering the Swedish army aged 13 in the Finnish Light Cavalry Brigade, he was present when Gustav III launched his coup-d’etat.

He was thereafter appointed the commanding officer of the Nyland Dragoons, holding this post until 1804, when he was made Ofverste (Colonel-in-Chief) of the newly raised Adlercreutz Regiment.

Forced to retreat due to the Swedish victories not being exploited, he was severely defeated by Nikolay Kamensky at the Battle of Oravais 14 September, which obliged him to abandon Finland.

Adlercreutz returned to Stockholm to take charge of a military junta ruling the country in place of the insane King Gustav IV Adolf after the Coup of 1809.

In 1813 Adlercreutz was made General and appointed Chief of Staff to Curt von Stedingk under the Crown Prince's Swedish Army of the North in Germany 1813.