Groupe Flammarion (French: [gʁup flamaʁjɔ̃]) is a French publishing group, comprising many units, including its namesake, founded in 1876 by Ernest Flammarion, as well as units in distribution, sales, printing and bookshops (La Hune and Flammarion Center).

Flammarion became part of the Italian media conglomerate RCS MediaGroup in 2000.

Éditions Gallimard acquired Flammarion from RCS MediaGroup in 2012.

Its headquarters in Paris are in the building that was the former Café Voltaire (named in honour of the writer and philosopher Voltaire), located on the Place de l'Odeon in the current 6th arrondissement of Paris.

The firm published Émile Zola, Maupassant, and Jules Renard, as well as Hector Malot, Colette, and a wide list of medical, scientific, geographical, historical works, and various autobiographies, including also the Père Castor children's series.