Petko Kirkov Kaloyanov Петко Кирков (Каракирков, Киряков, Калоянов), better known as Captain Petko Voyvoda (Капитан Петко Войвода; 5 December 1844 – 7 February 1900) was a 19th-century Bulgarian hajduk leader and freedom fighter who dedicated his life to the liberation of Bulgaria (and, particularly, the region of Thrace).

Petko Voyvoda was born in the Bulgarian village of Dogan Hisar, today Aisymi (Evros regional unit, Greece).

When a group of Turkish brigands attacked his wife, he fought and killed them all, including the leader of the bashibuzuks, Mehmed Kesedji Bey.

As part of this effort, he led the defeat of the 1878 Muslim insurgence in the Rhodopes organized by the British agent Saint Clair.

The TV series Captain Petko Voivode written by Nikolay Haytov and first aired in 1981 also popularized him as a national hero.