Carl Gustaf von Nieroth (died 1712) was a Swedish officer and Governor-General of Swedish Estonia 1709–1710 (though not formally installed) and of Finland 1710–1712. The exact date and location of his birth are unknown, but believed to be in Finland. He was a son of the Baltic German Otto Nieroth and Gertrud Baranoff. He was first recorded in 1671 as a cornet of the Swedish Army in Swedish Pomerania. In 1692 he had risen to the rank of lieutenant colonel, in 1700 to major general and in 1704 to lieutenant general.[citation needed] He was elevated to friherre and count on June 26, 1706.