A marlinspike is a tool used for splicing and working with rope.

Marlinspike may also refer to:

Terebra maculata, a snail known as the Marlinspike auger Marlinspike Hall, a château in Hergé's The Adventures of Tintin comics Moxie Marlinspike, a computer security expert Marlinespike hitch, a knot used to attach a line to a marlinspike