Marshall Allen is an American free jazz alto saxophonist, born May 25, 1924, in Louisville, Kentucky. Allen performs on flute, oboe, piccolo, and EVI (an electronic valve instrument made by the Akai company). He is best known for his long association with Sun Ra, lasting from the late 1950s until Ra's death, after which Allen has continued to lead the Sun Ra Arkestra.

Allen studied in Paris under [[artist:Ulysse Delecluse]] after being discharged from the US Army. He later played with the [[artist:James Moody And His Orchestra]] ‎under the name [[artist:Red Allen]].