A junkyard or surplus depot was a disposal site for defective, damaged, outmoded, and otherwise unused equipment.

Occasionally an entire space station became abandoned and a junkyard in itself, such as the Cardassian space station Empok Nor.

The Qualor II Surplus Depot Z15 was a Federation junkyard that contained the hulks of numerous retired starships, along with at least two space stations. Among the identified vessels that were located at the depot were the Vulcan transport T'Pau, located at Section 18-Alpha-12, and the holding vessel USS Tripoli, located along the outer rim. (TNG: "Unification I", "Unification II")

Abaddon was the owner of a Delta Quadrant junkyard known as "Abaddon's Repository of Lost Treasures." (VOY: "Alice")