Koss can refer to:
Curtea (Hungarian: Kurtya) is a commune in Timiș County, Romania. It is composed of three villages: Coșava (Kossó), Curtea and Homojdia (Homapatak).
Coordinates: 45°49′00″N 22°18′00″E / 45.8167°N 22.3°E / 45.8167; 22.3
Koss Corporation is an American company that designs and manufactures headphones. Headquartered in Milwaukee, Wisconsin since 1958, the company invented the first high fidelity stereophones. Koss continues to design and manufacture headphones and audio accessories.
John C. Koss founded the J.C. Koss Hospital Television Rental Company in 1953. After a short time Koss was looking for new ideas, and partnered with Martin Lange to eventually develop a stereo headphone. Based in Milwaukee, Wisconsin, USA, in 1991 Koss Audio & Video Electronics started producing and selling consumer electronics products as a separate company in Hazelwood, Missouri, USA. The Koss family owns more than 75% of the firm.
Having only a high-school education, John C. Koss worked with Lange, an engineer, to develop the headphone that launched the company almost by accident, as they came upon the headphone idea as a result of an attempt to market a portable phonograph. What made this product unique was the privacy switch feature, which gave listeners the opportunity to listen to the first Koss SP/3 Stereophones. Initially, the products purpose was to demonstrate to consumers the high-fidelity stereo sound of the portable phonograph.