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The Cadillac Commercial Chassis is a chassis that was built by the Cadillac division of General Motors. Produced from 1931 to 1979, the Commercial Chassis was constructed as an incomplete vehicle intended for use by coachbuilders for final assembly and fitment of bodywork. Produced on the D platform (exclusive to Cadillac) throughout its entire production, the Commercial Chassis was initially derived from the Series 355, shifting to the Series 75 from 1936 onward. Since 1960 they had a longer wheelbase by 16 cm.
Coinciding with a change in design regulations and the downsizing of Cadillac sedans, the Commercial Chassis was phased out as a distinct product line. The professional car basis would be continued by the Series 75 and successor flagship Cadillac sedans to current production.