Anton Grigoryevich Rubinstein (Russian: Антон Григорьевич Рубинштейн, romanized: Anton Grigoryevich Rubinshteyn; 28 November [O.S. 16 November] 1829 – 20 November [O.S. 8 November] 1894) was a Russian pianist, composer and conductor who founded the Saint Petersburg Conservatory. He was the elder brother of Nikolai Rubinstein, who founded the Moscow Conservatory.

As a pianist, Rubinstein ranks among the great 19th-century keyboard virtuosos. He became most famous for his series of historical recitals, seven enormous, consecutive concerts covering the history of piano music. Rubinstein played this series throughout Russia and Eastern Europe and in the United States when he toured there.

Although best remembered as a pianist and educator (most notably as the composition teacher of Tchaikovsky), Rubinstein was also a prolific composer; he wrote 20 operas, the best known of which is The Demon. He composed many other works, including five piano concertos, six symphonies and many solo piano works along with a substantial output of works for chamber ensemble.