The Naiad 18 is a Canadian trailerable sailboat, that was designed by Mark Ellis, first built from 1984 to 1986, and named for the mythological water sprites.

The boat was built by Luna Yachts in Oakville, Ontario, Canada, between 1984 and 1986, but it is now out of production. It is believed that 20 were completed. Although one was destroyed, by 2013, 19 remained in service.

The Naiad 18 is a small, open, recreational keelboat, built predominantly of fiberglass, with wood trim. It has a cat rig, a plumb stem, a vertical transom, a transom-hung rudder, a wishbone boom and a centerboard that folds up into a trunk. It displaces 1,100 lb (499 kg) and carries 550 lb (249 kg) of ballast.

The boat has a draft of 3.67 ft (1.12 m) with the centreboard extended and 0.67 ft (0.20 m) with it retracted, allowing beaching or ground transportation on a trailer.

The boat can be optionally fitted with a small outboard motor for docking and maneuvering.

The design has a hull speed of 5.61 kn (10.39 km/h).

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