The D platform, or D-body, was Cadillac' last full-size rear wheel drive automobile platform in the 1990s. It was closely related to the GM B platform, though the Cadillac used an extra-long 121.5 in wheelbase.

The last D-body Cadillac Brougham rolled off the line in 1992, leaving only arch-rival Lincoln producing large rear wheel drive luxury sedans. Today, however, the situation looks to reverse, with Lincoln switching to front wheel drive for most cars and Cadillac reintroducing rear wheel drive with their new Sigma platform. Chrysler has also reintroduced rear wheel drive with their new LX platform.