Dame Gruev, Bulgarian educator and activist, co-founded the Internal Macedonian Revolutionary Organization (died 1906)

Damyan Yovanov Gruev was а Macedonian Bulgarian teacher, revolutionary and insurgent leader in the Ottoman regions of Macedonia and Thrace. He was one of the six founders of the Internal Macedonian Revolutionary Organization. Gruev is seen as a national hero in Bulgaria and North Macedonia but his ethnicity is disputed between both countries.

The Internal Macedonian Revolutionary Organization, was a secret revolutionary society founded in the Ottoman territories in Europe, that operated in the late 19th and early 20th centuries.