Ossa was a Spanish motorcycle manufacturer which was active from 1924 to 1982 and from 2010 to 2015. Founded by Manuel Giró, an industrialist from Barcelona, Ossa was best known for lightweight, two-stroke-engined bikes used in observed trials, motocross and enduro. The company was known originally as Orpheo Sincronic Sociedad Anónima (O.S.S.A.) and was later renamed Maquinaria Cinematográfica, S.A..
The Ossa brand was reborn in 2010 when the trademark was purchased by an investment group and produced motorcycles until 2014 when, the company merged with the Spanish motorcycle manufacturer Gas Gas. However, when Gas Gas was absorbed by the Torrot Group in 2015, Ossa was not part of the deal and closed down again.