Subspace mines are explosive devices that hide in subspace until a target enters range.

The Dominion utilized anti-personnel subspace mines during the Dominion War, dubbed "Houdinis" by Starfleet personnel because they appeared at random. On AR-558, Ezri Dax and Kellin were able to modify a tricorder to reveal the mines. (DS9: "The Siege of AR-558")

Salina Prime, in the Delta Quadrant, is protected by subspace minefields. (VOY: "Warhead")

In 2377, a band of Quarren looking to conscript new workers used a subspace mine to disable the USS Voyager, contaminating the ship with tetryon radiation and forcing an evacuation. (VOY: "Workforce")