Junayd of Baghdad (; ; c. 830 - 910) was a mystic and one of the most famous of the early Islamic saints. He is a central figure in the spiritual lineage of many Sufi orders.

Junayd taught in Baghdad throughout his lifetime and was an important figure in the development of Sufi doctrine. Like Hasan of Basra before him, was widely revered by his students and disciples as well as quoted by other mystics.