Kaditcha was an automobile manufacturer in Australia. The company, formed by Queensland engineer Barry Lock, made open wheel and sports car racing cars, including cars for Formula 5000, Formula Pacific and Australian Formula 2.
The peak of Kaditcha's form was in the mid-1980s when Kaditcha sports cars dominated the Australian Sports Car Championship. Chris Clearihan won the 1982 Championship in a 5.0L Chevrolet powered version, with Kaditcha's finishing that year in 1st, 2nd and 3rd places. Clearihan finished 3rd in the 1983 Championship, which was won by Peter Hopwood driving a later model Kaditcha-Chevrolet that Lock built using a Lola T400 Formula 5000 as its base. Hopwood moved to the Australian Drivers' Championship in 1984 with Clearihan taking over the 1983 title winning car and finished second in the 1984 Championship.
Kadticha's most famous race car is one that no longer bears its name. The Romano WE84 raced by Bap Romano began its racing life in 1983 as the Kaditcha K583. Romano used the WE84 (re-engineered by former Williams and Tyrrell Formula One mechanic Wayne Eckersley) to easily win the 1984 Australian Sports Car Championship. It was Australia's first Group A Sports Car built with a closed top and Ground effects aerodynamics like the cars, such as the Porsche 956, seen at the time in the World Sportscar Championship. Bap Romano's 1984 ASSC domination was almost complete, setting Pole Position at every round, scoring fastest lap at for each race contested (Clearihan scored fastest lap in Heat 2 of Round 1), and won all bar Round 1 at Calder Park where Romano crashed heavily in Heat 1, damaging the car enough to ensure it was a non-starter in Heat 2. Clearihan's Kaditcha-Chev won Round 1.