Carl Gustaf Grimberg (September 22, 1875 in Gothenburg, Sweden – June 11, 1941 in Djursholm) was a Swedish historian.
His parents were Joel Grimberg and Charlotta (née Andersson). In 1919 he married Eva Carlsdotter Sparre (1895–1982).
Grimberg's most famous work is his history of Sweden, Svenska folkets underbara öden (1913-1924). In 1926 Grimberg began to publish his history of the world, Världshistoria, but he did not finish it before his death.