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The Dallara DW12 (formally named the Dallara IR-12) is an open-wheel formula racing car developed and produced by Italian manufacturer Dallara for use in the IndyCar Series. It replaced the aging Dallara IR-05 chassis in the 2012 IndyCar Series season and is to be used through the 2026 season, after which it is to be replaced by the planned Dallara IR-27.

Since 2012, all IndyCar races are contested with cars built on a common chassis supplied by Dallara, keeping costs to the fixed $349,000 per chassis negotiated by the IndyCar organization. The new specification of chassis also adds safety features, the most prominent being a partial enclosure around the rear wheels. Since 2015, Honda and Chevrolet have offered alternatives to the Dallara aerodynamic kit for the chassis.

The chassis is named after Dan Wheldon, who was the car’s test driver, and who was killed at Las Vegas Motor Speedway on October 16, 2011, the final race of the previous IR-05. The new front section is designed to prevent similar single-seater crashes such as the one that killed Wheldon. The nomenclature recalls that of the old Formula One team Ligier, whose cars were labeled JSxx after French F1 driver Jo Schlesser, who died in the 1968 French Grand Prix.

Dallara DW12 is currently the longest-serving IndyCar Series car chassis to date despite three different aero kit variants.