By Kilian, founded in 2007 by Kilian Hennessy (a descendant of the Hennessy cognac family), is a luxury niche fragrance house known for its artistic approach to perfumery, premium materials, and distinctive refillable bottle system. The brand emphasizes craftsmanship and storytelling, with each collection exploring themes such as seduction, nightlife, gourmand indulgence, and cultural symbolism. By Kilian fragrances often feature rich, opulent accords—including rum, vanilla, tobacco, rose, spices, woods, and animalic nuances—combined with modern niche trends.

The house is divided into several thematic lines, including "The Narcotics," "The Smokes," "The Cellars," and "The Fresh," each showcasing a unique olfactory narrative. Notable releases such as "Love, Don't Be Shy," "Black Phantom," "Straight to Heaven," and "Back to Black" have contributed to the brand's strong international presence. Many of its scents are characterized by bold compositions, dense layers, and long-lasting performance, making them popular among collectors and niche fragrance enthusiasts.

By Kilian is also recognized for its commitment to eco-luxury through refillable perfume bottles and decorative lacquer cases, reinforcing its identity as a high-end artistic house. Since being acquired by Estée Lauder Companies, By Kilian has expanded its global distribution while maintaining its niche sensibility.

Today, the brand stands as a key player in modern luxury perfumery, known for blending sensuality, creativity, and craftsmanship in highly recognizable, statement-making fragrances.