Green Crescent (Turkish: Yeşilay) is a non-profit organisation that fights smoking, alcohol, and other addictions such as drug use, and provides services and protection methods to all citizens, especially the young, affected by harmful habits.

[2] It was established on 5 March 1920 in Istanbul.

[3] One of its chairs was Ayhan Songar.

[4] As of 2015, the Green Crescent is a member of the following: An initiative is underway to gather national Green Crescents of various countries under one roof as the World Green Crescents Federation based in Istanbul.

[6][7] This article about an organisation in Turkey is a stub.