Santiago Herrero Ruiz was a Spanish professional motorcycle racer. He competed in the FIM Grand Prix motorcycle racing world championships from 1968 to 1970 as a member of the Ossa factory racing team. As Spain began to emerge from the Franco Era, Herrero became the country's most promising international motorcycle racer until he died from injuries sustained while competing in the 1970 Isle of Man TT race.

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..