Emanuel Ax (born 8 June 1949) is a Grammy-winning American classical pianist. He is currently a teacher on the faculty of the Juilliard School. He is considered one of the best known concert pianists of the 21st century.

Ax is a particular supporter of contemporary composers and has given three world premieres in the last few seasons; Century Rolls by John Adams, Seeing by Christopher Rouse and Red Silk Dance by Bright Sheng. He also performs works by such diverse figures as Sir Michael Tippett, Hans Werner Henze, Joseph Schwantner and Paul Hindemith, as well as more traditional composers such as Haydn, Mozart, Beethoven, and Chopin.

Ax regularly performs duo recitals with cellist Yo-Yo Ma and played quartets with Ma and violinists Isaac Stern and Jaime Laredo. Before the quartet had to disband in 2001 due to the death of Stern, they recorded works for Sony by Brahms, Fauré, Beethoven, Schumann and Mozart. Ax is also a featured guest artist in a documentary film about the Toronto Symphony Orchestra and Peter Oundjian, Five Days in September; the Rebirth of an Orchestra.

He is a recipient of Yale University's Sanford Medal and also holds an honorary doctorate of music from Yale awarded in May 2007.