The Fosdick Mountains () is an East-West trending mountain range with marked serrate outlines, standing along the south side of Balchen Glacier at the head of Block Bay, in the Ford Ranges of Marie Byrd Land.
Discovered by the Byrd Antarctic Expedition in 1929, and named by Byrd for Raymond B. Fosdick, president of the Rockefeller Foundation. This article incorporates public domain material from the United States Geological Survey document "Fosdick Mountains" (content from the Geographic Names Information System).