Salvador Contreras Sánchez (10 November 1910 – 7 November 1982) was a Mexican composer and violinist, a member of the Grupo de los cuatro.
His musical education was at the Mexico City Conservatory, where he studied violin with Silvestre Revueltas, music theory with Candelario Huízar, and composition and conducting with Carlos Chávez.
Together with Daniel Ayala Pérez, Blas Galindo, and José Pablo Moncayo, he formed the Grupo de jóvenes compositores in 1935, which later became the Grupo de los cuatro.
His Obertura en tiempo de danza (Overture in Dance Time, 1942), for example, prominently uses measures in 7/8 and 5/8, which alternate with the more common 2/4 and 3/4.
In the mid-1960s he began using serial techniques, allying him with Manuel Enríquez and losing him his former broad public appeal.