Flammarion may refer to:

• Camille Flammarion (1842–1925), French astronomer and author
• Gabrielle Renaudot Flammarion (1877–1962), French astronomer, second wife of Camille Flammarion
• Sylvie Flammarion (1836-1919), French feminist and pacifist, first wife of Camille Flammarion
• Flammarion engraving by unknown artist; appeared in a book by Camille Flammarion
• Flammarion (lunar crater), a lunar crater named after Camille Flammarion
• Flammarion (Martian crater), a Martian crater named after Camille Flammarion
• Groupe Flammarion, a French publishing company
• Camille Flammarion Observatory, the astronomical observatory