The ETAP 20 is a Belgian trailerable sailboat that was designed by E. G. van de Stadt as a cruiser and first built in 1975.

The design was built by ETAP Yachting in Lokeren, Belgium between 1975 and 1992, with 1,000 boats completed, but it is now out of production.

The ETAP 20 is a recreational keelboat, built predominantly of fibreglass, with wood trim. It has a fractional sloop rig, a raked stem, a plumb transom, a kick-up transom-hung rudder controlled by a tiller and a weighted bulb lifting keel. The keel is raised and lowered with a worm gear operated from on deck. It displaces 1,874 lb (850 kg) and carries 441 lb (200 kg) of ballast.

The boat has closed cell foam sandwich compartments that render it unsinkable and also will float it level, even when the boat is full of water.

The boat has a draft of 3.74 ft (1.14 m) with the lifting keel extended and 1.57 ft (0.48 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 manoeuvring.

The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and two straight settee quarter berths in the main cabin along with a drop-leaf table. The galley is located on both sides just aft of the bow cabin. The galley is equipped with a single-burner stove and a sink. The head is located under the "V"-berth in the bow cabin. Cabin headroom is 48 in (120 cm).

For downwind sailing the design may be equipped with a spinnaker of 22.00 m² (236.8 sq ft).