Komitadji, Comitadjis, or Komitas (Bulgarian, Macedonian, Serbian: Комити, Romanian: Comitagiu, Greek: Κομιτατζής, plural: Κομιτατζήδες, Turkish: Komitacı, Albanian: Komit) means in Turkish a "committee members". It refers to members of rebel bands (chetas) operating in the Balkans during the final period of the Ottoman Empire. They fought against the Turkish authorities and were supported by the governments of the neighbouring states, especially of Bulgaria.
Komitadji was used firstly to describe the members of the Bulgarian Revolutionary Central Committee during the April uprising in 1876. The term is often employed to refer later to groups of rebels associated with the Bulgarian Macedonian-Adrianople Revolutionary Committees and the Supreme Macedonian-Adrianople Committee called by the Turks simply the Bulgarian Committees.
In interwar Greece and Yugoslavia the term was used to refer to the bands organized by the pro-Bulgarian Internal Macedonian Revolutionary Organisation and Internal Thracian Revolutionary Organisation, which operated in Vardar and Aegean Macedonia and Western Thrace. In interwar Romania, the term was used to refer to the bands organized by the pro-Bulgarian Internal Dobrujan Revolutionary Organisation, which attacked the Romanian outposts and the Aromanian colonists in Southern Dobruja. During the Second World War this name was used to designate the members of the pro-Bulgarian Ohrana active in Northern Greece.