Bungie confirmed that Xur will be back in Destiny 2 on September 15, 2017! Until then, if you are looking for Xur on legacy Destiny 1 just scroll down.
Your bummed buddies at Where is Xur 🙁
Xur location for Destiny 1: The Reef
“Bodies come and go but the cells remember and if they forget the Nine remember it for us.” -Xur