The Catalina 309 is an American sailboat, that was designed by Gerry Douglas and first built in 2005.

The boat was built by Catalina Yachts in the United States starting in 2005, but is now out of production.

The Catalina 309 is a small recreational keelboat, built predominantly of fiberglass. It has a fractional sloop rig, an internally-mounted spade-type rudder and a fixed fin keel. It displaces 9,800 lb (4,445 kg) and carries 4,000 lb (1,814 kg) of ballast.

The boat has a draft of 6.25 ft (1.91 m) with the standard keel and 4.4 ft (1.3 m) with the optional shoal draft wing keel.

The boat is fitted with a Japanese Yanmar 3YM20 diesel engine of 21 hp (16 kW). The fuel tank holds 27 U.S. gallons (100 L; 22 imp gal) and the fresh water tank has a capacity of 46 U.S. gallons (170 L; 38 imp gal).

The design has a hull speed of 6.9 kn (12.8 km/h).

The design was named a Boat of the Year winner by Cruising World magazine for 2007, including "top overall Domestic Boat of the Year award".