The Hullmaster 27, also called the HM-27, is a Canadian sailboat, that was designed by Edward S. Brewer and Robert Walstrom and first built in 1974.

[1][4][5][6] The Hullmaster 27 is a small recreational keelboat, built predominantly of fiberglass, with wood trim.

It has a masthead sloop rig, a skeg-mounted rudder and a fixed fin keel.

[1][2][4] The boat has a draft of 4.25 ft (1.30 m) with the standard keel.

[1][4] The boat has a PHRF racing average handicap of 225 with a high of 222 and low of 231.