The Signet 20 is a recreational keelboatHenkel, Steve: The Sailor's Book of Small Cruising Sailboats, page 137. International Marine/McGraw-Hill, 2010. built in the United Kingdom and in the United States, starting in 1960. It is now out of production.

The Signet 20 is built predominantly of glassfibre, with wood trim. It has a masthead sloop rig; a spooned, raked stem and an angled transom. It displaces and carries of iron ballast.

The design was produced with a number of keel and rudder configurations, including a single fin keel, twin bilge keels, skeg-mounted rudders or transom-mounted rudders, all controlled by a tiller. With the fin keel the boat has a draft of , while the twin bilge keels give a draft of .

The boat is normally fitted with a small outboard motor or an inboard engine for docking and maneuvering.

The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and two straight quarter berths aft. The galley is located on both sides just forward of the companionway ladder. The galley is equipped with a stove to starboard sink to port. The head is located in the bow cabin under the "V"-berth and is separated from the main cabin by a curtain. Cabin headroom is .

The design has a hull speed of .

The boat is supported by an active class club that organizes racing events, the Hurley Owners Association.

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