A locating structure for a slide assembly includes a first track, a second track, a releasing member, and a locating member; a locating tab is provided at a front end of the first track; the second track is inserted and connected onto the first track to slide thereon; the second track is provided with a locating portion; the releasing member is mounted to an inner side of the second track; one end of the releasing member is provided with an operation button; the locating member is located on one side of the operation button and has a propped portion and a plunged portion; the locating member provides resilience for the propped portion to hold against the locating portion of the second track; and the locating member drives the propped portion to disengage from the locating portion by means of the plunged portion.