Selected exhibitions showing work by Helleu:
'Boldini-Helleu-Sem, Protagonisti e miti della Belle Epoque', Castello Pasquini (Toscane), Italy, 2006;
'Versailles: vie artistique, littéraire et mondaine, 1889-1939', Musée du Lambinet de Versailles, 2003;
'Paul Helleu', Musée Eugène Boudin, Honfleur, 1993;
'Paul Helleu', Musée de Vannes, 1991;
'Paul Helleu', Musée Bonnat, Bayonne, 1990;
'Les Bains de Mer', Musée de Dieppe, 1961.

Work by Paul-César Helleu is to be found in the collection of many international museums, to name a few: the Hermitage in St. Petersburg, the Louvre and Musée d'Orsay in Paris, the Museum of Fine Arts in Boston, the Art Institute of Chicago, and Tate Gallery in London.