Leylan is a city in East Azerbaijan Province, Iran.
Leylan () may also refer to various places in Iran: Leylan, Hamadan Leylan, alternate name of Lilas, Hamadan Province Leylan, Markazi Leylan, Zanjan Leylan District, in East Azerbaijan Province Leylan-e Jonubi Rural District, in East Azerbaijan Province Leylan-e Shomali Rural District, in East Azerbaijan Province Leylan can also refer to places outside of Iran: Leylan Subdistrict in Iraq