Herman Gregorius Gummerus (24 December 1877 – 18 July 1948) was a leading Finnish classical scholar, diplomat, and one of the founders of the Patriotic People's Movement (IKL).

Born in Saint Petersburg into a Swedish speaking family, Gummerus became an expert on the economy and society of Ancient Rome, and lectured at the University of Helsinki from 1911 to 1920 and again from 1926 to 1947.

[3] Gummerus' doctoral dissertation Der römische Gutsbetrieb als wirtschaftlicher Organismus nach den Werken des Cato, Varro und Columella (1906) examined large Roman estates using mainly literary sources.

[1] On his return to Finland, and with the leaders of the Lapua Movement mostly imprisoned, he joined with Erkki Räikkönen, a fellow Swedish-speaker, and Vilho Annala to form IKL as a slightly more moderate continuation.

Driven by an inherent conservatism, Gummerus desired an electoral alliance with the National Coalition Party but soon found that the rank and file of IKL had no interest in this.