Émile-Alain Séguy (1877–1951) was a French decorative designer whose work spanned the Art Nouveau and Art Deco movements. Trained at the École des Arts Décoratifs in Paris and later head of the art department at the Grands Magasins du Printemps, he became one of France's foremost ornamental designers.

Séguy drew almost entirely on the natural world — flowers, foliage, minerals and, above all, insects and butterflies — rendering them through the labour-intensive pochoir (stencil) technique in portfolios such as Papillons and Insectes (both 1924) and Floréal. Often confused with the entomologist Eugène Séguy, he remains celebrated for designs of dazzling, scientifically exact colour.