Sara Cahier (8 January 1870 – 15 April 1951) was an American-born mezzo-soprano or contralto singer in opera and lieder, singing primarily in Europe.
Cahier later acquired Swedish citizenship.
She was associated with Gustav Mahler, and was one the soloists in the posthumous premiere of his Das Lied von der Erde in 1911.
She sang at the Metropolitan Opera in New York, and was a teacher at the Curtis Institute of Music in Philadelphia.