King Musical Instruments (originally founded as the H. N. White Company) is a former musical instrument manufacturing company located in Cleveland, Ohio, that used the trade name King for its instruments. In 1965 the company was acquired by the Seeburg Corporation of Eastlake, Ohio, and the name changed to "King Musical Instruments".

After four changes of ownership for King Musical Instruments since 1980, the rights to the King name are currently owned by Conn-Selmer, Inc., a subsidiary of Steinway Musical Instruments, who use it as a brand for brass instruments including trumpets, trombones, tubas, and marching brasses.

The company was founded as the "H.N. White Company" in 1893 by Henderson White, an engraver and instrument repairman. White designed a trombone for Thomas King, a local player. It became the company's first successful model when it was adopted by Al Pinard, then a famous trombone player. White later designed other brass instrument models, including cornets and baritones. In 1903, The H.N. White company hired Foster A. Reynolds, a talented brass instrument maker at the J.W. York & Sons company. He worked with White to further develop instruments. H. N. White sought to expand its offerings to woodwinds starting in 1908, importing Evette & Schaeffer saxophones and clarinets manufactured by the Buffet Crampon Company of France. After the import rights for Buffet products were lost to Carl Fischer of New York in 1910, White started importing woodwinds from the V. Kohlert Company, then located in the Czech province of the Austro-Hungarian Empire.

The First World War interrupted the trade of the Czech instruments, so White sought a domestic supplier in the Cleveland Musical Instrument Company in 1916. Many of the earliest saxophones supplied by Cleveland Musical Instruments were made for military bands as the United States entered World War I. H. N. White built a plant to manufacture orchestral woodwinds in 1917. Subsequently, the "Cleveland" and "American Standard" brands were used for less expensive instruments marketed to schools and marching bands, while the "King" brand was reserved for professional grade instruments. In 1925, H.N. White acquired the Cleveland Musical Instrument Company.

In 1935 Foster Reynolds left his position as General Manager of the H.N. White Company, and founded the rival F.A. Reynolds company. Reynolds would later design the extremely successful Ambassador line of brasswind instruments for F. E. Olds. The H.N. White Company began producing stringed instruments in 1935.

Henderson White died in 1940. His brother, Hugh E. White, acted as president, and his widow, Edna White, took over as president in 1941. During World War II, the company received government contracts to assemble radar units and fuses. Edna's daughter, Cathryn White Ludwig, married William F. Ludwig, Jr of the drum-percussion company W.F.L. Drum Company. Cathryn was named the Vice-President of H.N. White in 1945, making it one of the few companies in America headed by two women.

H. N. White became a major player in the saxophone market dominated by Buescher, C.G. Conn, and Martin during the interwar years. King saxophones had brazed-on tonehole chimneys, which have significant advantages over both the soldered-on and drawn types used by other manufacturers. Brazing was also a relatively high cost process. The King Saxello was a soprano saxophone with a downward curve near the mouthpiece and a bell curved 90 degrees from the body, for optimal playing position and acoustic qualities. With improvements to saxophone design embodied by the King Zephyr in 1935, H. N. White's position as a leading manufacturer of saxophones was firmly established. In 1937 the Zephyr gained a double-socket neck that eliminated the large collar on the body tube at the neck joint and the Zephyr Special was introduced as a deluxe version with a changed bore, improved keytouches for the left hand table, and mother of pearl inlay on all keytouches. Sterling silver necks and bells became available.

The King line's run of success continued after World War II, with highly desired lines of woodwind and brass instruments. Several famous musicians were featured playing King instruments, including Tommy Dorsey, Charlie Parker, and Harry James. The Zephyr Special was rebranded the Super 20 in 1945, with a changed lever mechanism for the neck octave key. With improved left hand cluster mechanisms introduced around 1949, the Super 20 represented the zenith of H. N. White's achievements as a saxophone manufacturer. The visually and aurally striking horn was one of the most desired ever. However, new competition from Selmer (Paris), aided by the exchange rate between the French Franc and the US Dollar in the postwar era, put price pressure on the American manufacturers and H. N. White was no exception. Through the mid-1950s into the 60s, the imperative of cutting costs grew and features were dropped to simplify manufacture. During that same period, the Zephyr was sold as a student-line instrument.