Eau de Cologne or simply cologne is a perfume originating from Cologne, Germany. Originally mixed by Johann Maria Farina in 1709, it has since come to be a generic term for scented formulations in typical concentration of 2–5% and also more depending upon its type of essential oils or a blend of extracts, alcohol, and water. In a base of dilute ethanol (70–90%), eau de cologne contains a mixture of citrus oils, including oils of lemon, orange, tangerine, clementine, bergamot, lime, grapefruit, blood orange, bitter orange, and neroli. It can also contain oils of lavender, rosemary, thyme, oregano, petitgrain, jasmine, olive, oleaster, and tobacco.

Johann Maria Farina gegenüber dem Jülichs-Platz GmbH is the world's oldest eau de Cologne and perfume factory. It traces its origins to a luxury goods retail business founded in 1709 in Cologne by Giovanni Battista Farina, who was subsequently joined in the business by his younger brother, Giovanni Maria Farina. The short form 'Farina gegenüber' and the French name 'Jean Marie Farina vis-à-vis de la place Juliers' were also commonly used over a long period of time. The company's logo is a red tulip.