The Aero 20 is a recreational keelboat designed by Gary Mull as a daysailer. It was first built in 1999.
The boat was built by Catalina Yachts starting in 1999, but has since ceased production.
The Aero 20 is built predominantly of fiberglass. It has a fractional sloop rig, a transom hung rudder and a conventional fin keel giving a draft of . The hull design was based on the Independence 20, a boat designed by Mull for disabled sailors.
The boat is rigged with the unusual "aero rig", whereby the main and jib sails are on a common fore-and-aft boom.
The design displaces and carries of ballast. It has a hull speed of .