The Poacher 21, also called the Parker Dawson Poacher, is an American trailerable sailboat that was designed by W. Richardson as a racer-cruiser and first built in 1980.

The design was built by Parker Dawson Yachts in Hingham, Massachusetts, United States from 1979 until 1984, with about 50 boats completed, but it is now out of production.

The Poacher 21 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It has an unstayed cat-rigged ketch rig, a raked stem, a plumb transom, a transom-hung rudder controlled by a tiller and a lifting keel. It displaces 1,800 lb (816 kg) and carries 550 lb (249 kg) of ballast.

The two masts are identical, with the aft one mounted slightly lower. The sails are equipped with luff sleeves, rather than halyards. Both sails have wishbone booms. The sails are identical and interchangeable.

The boat has a draft of 4.50 ft (1.37 m) with the lifting keel extended and 1.67 ft (0.51 m) with it retracted, allowing operation in shallow water or ground transportation on a trailer.

The boat is normally fitted with a small 3 to 6 hp (2 to 4 kW) outboard motor for docking and maneuvering.

The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and two straight settee berths in the main cabin. The galley is located on the port side just forward of the companionway ladder and is equipped with a sink. Cabin headroom is 48 in (122 cm).

The design has a PHRF racing average handicap of 201 and a hull speed of 5.6 kn (10.4 km/h).