Carl Gustaf Warmholtz, (1713–1785) was a Swedish scholar, historian, writer, and a collector of historical books and manuscripts. A large bibliography of books and texts concerning Sweden is his main work still widely used and "remains the first place to look for Swedish imprints published before 1774". Warmholtz preferred country life, so he bought about 1747 the manor near Nyköping and called it Kristineholm. Warmholtz's collection of manuscripts is preserved at the Library of Uppsala University.