Arzu is a village and municipality in the Khachmaz Rayon of Azerbaijan. It has a population of 1,249.^{[citation needed]}

Hilal Mammadov (Azerbaijani: Hilal Məmmədov; b. 1959, Astara Rayon, Azerbaijan SSR) is an Azerbaijani journalist and human rights activist. He is the chief editor of the Baku-based newspaper "Tolyshi sado" ("The Voice of Talysh"), the only newspaper in Azerbaijan printed in the minority Talysh language. After Novruzali Mammadov died in custody, Hilal Mamedov became a second community leader for the Talysh people. He is also known as the author of the meykhana video Ty kto takoy? Davay, do svidaniya! which became an Internet meme both in Azerbaijan and abroad.

Hilal Mammadov is a graduate of the mathematics program of the Baku State University. He is a consultant of the Institute for Peace and Democracy and the head of the Committee for the Defence of Novruzali Mammadov (no relation), a Talysh human rights activist and linguist charged in 2008 with espionage in favour of Iran (in 2010 Novruzali Mammadov died as a result of torture while in prison in Azerbaijan). In 2008, Hilal Mammadov appealed to foreign diplomats to intervene to help Novruzali Mammadov and his assistant Elman Guliyev, who he said were victims of a campaign against minorities.