Maison Jansen (French: [mɛzɔ̃ ʒɑ̃sɑ̃]; English: House of Jansen) was a Paris-based interior decoration office founded in 1880 by Dutch-born Jean-Henri Jansen. Jansen is considered the first truly global design firm, serving clients in Europe, Latin America, North America and the Middle East. This House was located at 23, rue de l'Annonciation, Paris, and closed in 1989.