A grappling hook is a hook fired from a grappling gun and used to secure a line to an object, usually so that people can move from one place to another on the line.

In 2525, Zak Kebron made up a story about his actions during the Dominion War, which included himself and other USS Excalibur crewmembers boarding the USS Corinth with grappling guns and grappling hooks. (NF short story: "Stone Cold Truths")