Rayna Kasabova (Cyrillic: Райна Касабова; 1 May 1897, in Karlovo – 25 May 1969) was a volunteer nurse with the Bulgarian Air Force and the first woman in the world who participated in a military flight during the First Balkan War in 1912. On 30 October 1912 at age 15, Kasabova was an observer in a Voisin aircraft that flew over enemy positions in Edirne. Kasabova threw out Turkish language propaganda leaflets.