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.
The Ilinden–Preobrazhenie Uprising, or simply the Ilinden Uprising, of August–October 1903, was an organized revolt against the Ottoman Empire, which was prepared and carried out by the Internal Macedonian-Adrianople Revolutionary Organization, with the support of the Supreme Macedonian-Adrianople Committee, which included mostly Bulgarian military personnel. The name of the uprising refers to Ilinden, a name for Elijah's day, and to Preobrazhenie which means Feast of the Transfiguration. Some historians describe the rebellion in the Serres revolutionary district as a separate uprising, calling it the Krastovden Uprising, because on September 14 the revolutionaries there also rebelled. The revolt lasted from the beginning of August to the end of October and covered a vast territory from the western Black Sea coast in the east to the shores of Lake Ohrid in the west.
Damyan Yovanov Gruev was а 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.
Gyorche Petrov Nikolov born Georgi Petrov Nikolov, was a Bulgarian teacher and revolutionary, one of the leaders of the Internal Macedonian Revolutionary Organization (IMRO). He was its representative in Sofia, the capital of Principality of Bulgaria. As such he was also a member of the Supreme Macedonian-Adrianople Committee (SMAC), participating in the work of its governing body. During the Balkan Wars, Petrov was a Bulgarian army volunteer, and during the First World War, he was involved in the activity of the Bulgarian occupation authorities in Serbia and Greece. Subsequently, he participated in Bulgarian politics, but was eventually killed by the rivaling IMRO right-wing faction. According to the Macedonian historiography, he was an ethnic Macedonian.
Nikola Yanakiev Karev was a Macedonian Bulgarian revolutionary. He was born in Kruševo and died in the village of Rajčani both today in North Macedonia. Karev was a local leader of what later became known as the Internal Macedonian Revolutionary Organization (IMRO). He was also a teacher in the Bulgarian Exarchate school system in his native area, and a member of the Bulgarian Workers' Social Democratic Party. Today he is considered a hero in Bulgaria and in North Macedonia.
Kruševo is a town in North Macedonia. In Macedonian the name means the 'place of pear trees'. It is the highest town in North Macedonia and one of the highest in the Balkans, situated at an altitude of over 1350 m above sea level. The town of Kruševo is the seat of Kruševo Municipality. It is located in the western part of the country, overlooking the region of Pelagonia, 33 and 53 km from the nearby cities of Prilep and Bitola, respectively.
Tane Nikolov was a Bulgarian revolutionary and member of the revolutionary movement in Macedonia, Thrace and Pomoravlje. He was among the leading members of the Secret Macedonian-Adrianople Revolutionary Organization, Internal Western Outland Revolutionary Organisation and the leader of the Internal Thracian Revolutionary Organisation. Nikolov was also participant in the wars for National unification of Bulgaria.
Petar Dimitrov Angelov was a Bulgarian military officer and a revolutionary, a member of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO).
Ivan Naumov, nicknamed Alyabaka or Alyabako was a Bulgarian revolutionary, a member of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO).
Krastyo Hadzhipetrov Asenov, nicknamed Mechkata, Ogneniot daskal and Cherkeza, was a Bulgarian revolutionary figure active in the region of Macedonia, one of the voyvodas of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO) for the Enidzhe Vardar region. He took part in the liberation struggles of the Macedonians at the beginning of the 20th century.
Slaveyko Arsov Kikiritkov was a Macedonian Bulgarian revolutionary, leader of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO) for the region of Resen. He is regarded an ethnic Macedonian in North Macedonia.
Nikola Andreev was a Bulgarian revolutionary who worked in the Internal Macedonian-Adrianople Revolutionary Organization (IMARO).
Nikola Andreev (1879–1911), known as Alay Bey, was a Bulgarian Army officer and revolutionary of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO). He was the leader of a revolutionary band in the Kostur region and a participant in the Ilinden-Preobrazhenie Uprising.
Georgi Atsev, known as Goga, was a Bulgarian revolutionary, a worker of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO) in the Prilep region.
Petar Atsev was a Macedonian Bulgarian revolutionary, and a voyvoda of the Internal Macedonian-Adrianople Revolutionary Organization (IMARO) for the region of Prilep. He worked as a Bulgarian teacher.
Mirche Atsev, or Mirče Acev, nicknamed Orovchanets, was a Bulgarian revolutionary from Ottoman Macedonia, a leader of an Internal Macedonian-Adrianople Revolutionary Organization (IMARO) revolutionary band.
The Strandzha Commune, also known as the Strandzha Republic, was a short-lived anarchist commune in East Thrace. It was proclaimed during the Preobrazhenie Uprising in 1903 by rebels of the Internal Macedonian Adrianople Revolutionary Organization (IMARO), in the Adrianople vilayet of the Ottoman Empire.
Aleksandar Turundzhev was a Bulgarian revolutionary from Ottoman Macedonia and leader of the Lerin cheta of the Internal Macedonian Adrianople Revolutionary Organization. According to the post-WWII Macedonian historiography, he was an ethnic Macedonian.
Petar (Pere) Naumov Toshev was a Bulgarian teacher and an activist of the Internal Macedonian-Adrianople Revolutionary Organization. In the historiography in North Macedonia he is considered an ethnic Macedonian revolutionary.
Nikola Kirov was a Bulgarian teacher, revolutionary and public figure, a member of IMRO.
IMRO 
Kingdom of Bulgaria 
Bulgarian Army 
Distinguished Service Cross