ABSTRACT Since achieving independence, Azerbaijan has employed its Islamic identity in its foreign policy to develop an international Islamic agenda concerning the Nagorno-Karabakh (NK) conflict. It has promoted the notion of Islamic solidarity and diversified its strategic interests in the conflict. The study aims to analyse Azerbaijan’s diplomatic strategies to garner comprehensive support from the Organization of Islamic Cooperation (OIC) in the Nagorno-Karabakh conflict, focusing on the 2020 war. The paper argues that Azerbaijan has developed Islamic diplomacy and instrumentalized religion as one of the components of its foreign policy against Armenia and the de facto Republic of Nagorno-Karabakh. During the 2020 war, Azerbaijan applied the discourse of Islamic solidarity and the Azerbaijani narratives on the NK conflict that have been introduced in the OIC during the last three decades.