Dejanović (onye a na-akpọ Konstantin (Kostadin) Dejanović) (; 1365-95) bụ onye Serbian magnate nke chịrị nnukwu ógbè dị n'ebe ọwụwa anyanwụ Masedonia n'okpuru ọchịchị Ottoman, n'oge ọdịda nke Alaeze Ukwu Serbia. Ọ nọchiri nwanne ya nwoke nke okenye bụ Jovan Dragaš, onye bụ onye Ottoman na-akwado ya kemgbe Agha Maritsa
(1371) nke bibiri akụkụ nke ndị isi Serbia. Ụmụnne ahụ nwere ọchịchị nke ha ma na-akụ mkpụrụ ego dị ka ụdị Nemanjić si dị. Nwa ya nwanyị bụ Jelena lụrụ Eze Ukwu Byzantine bụ́ Manuel nke Abụọ Palaiologos na 1392. Ọ dara n'agha nke Rovine (17 Mee 1395), na-ejere ndị Ottoman ozi megide Wallachia, na-alụ ọgụ n'akụkụ ndị Serbian magnates Stefan Lazarević na Marko Mrnjavčević.