The Sonata 8 is a sailboat that was designed by American Gary Mull as a one design racer and first built in 1979.

The boat was built by Investigator Yachts in Australia starting in 1979, but the design is out of production.

The Sonata 8 design was developed into the Sonata 26 in 1980 and produced by the same manufacturer. The two boats share the same specifications.

The Sonata 8 is a small recreational keelboat, built predominantly of fiberglass, with wood trim. It has a fractional sloop rig, a transom-hung rudder and a lifting or optionally fixed fin keel. It displaces 2,822 lb (1,280 kg) and carries 500 lb (227 kg) of ballast.

The boat has a draft of 5.09 ft (1.55 m) with the keel down and 0.69 ft (0.21 m) with the keel retracted. The fixed keel version has a draft of 5.2 ft (1.6 m).

The design has a hull speed of 5.96 kn (11.04 km/h).

After its introduction in 1979 the design was raced in Australia as a one-design class.

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