Pierre Dominique Costantini (16 February 1889 – 30 June 1986) was a French soldier, journalist, writer.

In 1940, he founded the collaborationist Ligue française d’épuration, d’entraide sociale et de collaboration européenne and with Jean Boissel, Marcel Déat, Pierre Clémenti (politician) and Eugène Deloncle co-founded the Légion des volontaires français contre le bolchevisme (LVF).

He edited the Ligue's organ, the journal L'Appel.

In 1943, he founded the Union des journalistes anti-maçons.

He later pursued a journalistic career and published several essays.