The Cal 39 is an American sailboat that was designed by C. William Lapworth as a racer-cruiser and first built in 1970.

[1][2][3][4] The design was built by Jensen Marine/Cal Yachts (Bangor Punta) in the United States.

[1][5] Production of the design was cut short when first year sales did not match expectations, due to the boat not fitting the newly adopted IOR racing rules.

It was replaced in the product line by the newly designed Cal 39 Mark II in 1978.

It has a masthead sloop rig, a raked stem, a slightly raised counter reverse transom, a skeg-mounted rudder controlled by a wheel and a fixed fin keel.