Ivan Garvanov (December 23, 1869, Stara Zagora, today Bulgaria - November 28, 1907, Sofia) was a Bulgarian revolutionary and leader of the revolutionary movement in Macedonia and Eastern Thrace. He was among the leaders of the Bulgarian Secret Revolutionary Brotherhood and later of the Bulgarian Macedonian-Adrianople Revolutionary Committees (BMARC). The BMARC was later known as the Secret Macedonian-Adrianople Revolutionary Organization (SMARO) and then officially changed its name to the Internal Macedonian Revolutionary Organization (IMARO) in 1905.
He learned mathematics in Sofia, and Vienna. Garvanov later worked as a Bulgarian teacher in Thessaloniki. In 1897 he founded Bulgarian Secret Revolutionary Brotherhood and later entered the BMARC and in 1902 he was elected as a member of Central Committee. In 1903 Garvanov became a leader of BMARC.
Under the leadership of Garvanov, the IMARO (as the BMARC was then known) made a decision supporting military revolt. Garvanov, himself, did not participate in the uprising, because of his arrest and exile in Rhodos. Garvanov, along with Boris Sarafov was killed by Todor Panitsa, the left wing leader of IMARO, in 1907.