The Lancia Delta Group A is a rally car built by Lancia to compete in the World Rally Championship. It is based on the Lancia Delta road car and replaced the Lancia Delta S4.

The car was unveiled for the 1987 World Rally Championship season and dominated the World Rally Championship, claiming 46 overall WRC wins and winning the constructors' championship six times in a row from 1987 to 1992, as well as titles. in the drivers' championship for Juha Kankkunen (1987 and 1991) and Miki Biasion (1988 and 1989). These results make Lancia the most successful brand in the history of the WRC and Delta the most successful car ever.

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