Eugène Alain Séguy (known as E. A. Séguy, 1889–1985) was a French artist and designer best known for his work in the Art Deco and Art Nouveau styles. He specialized in creating striking decorative patterns and illustrations, often inspired by nature, especially butterflies, insects, and plants.

Key characteristics of Séguy’s style include:

• Exquisite detailing of natural forms.
• Vibrant, bold color palettes.
• Symmetrical and geometric compositions, bridging Art Nouveau’s organic curves and Art Deco’s structured elegance.
• A focus on scientific accuracy combined with artistic stylization.

Séguy created numerous decorative art portfolios, such as Papillons (butterflies) and Insectes, which showcased his intricate patterns and designs for textiles, wallpapers, and other decorative purposes. His work remains a timeless fusion of art and natural science.