Ernst Pauer (21 December 1826 – 5 May 1905) was an Austrian pianist, composer and educator.
Pauer formed a direct link with great Viennese traditions: he was born in Vienna, his mother was a member of the famous Streicher family of piano makers, and for a time (1839–44) he was a piano pupil of Mozart's son, F. X. W. Mozart and a composition student of Simon Sechter. After further study with Franz Lachner in Munich (1845–47) he worked as a conductor and composer in Mainz, before moving to London in 1851.
From the outset Pauer's piano playing was admired in London, and there he developed a series of concerts, with copious programme notes, that illustrated the development of keyboard music from 1600 to modern times; in later years he lectured on this and many other topics. For five years, he was on the staff of the National Training School for Music (1859–64) and was later recruited in 1876 as principal Piano Professor in the newly formed Royal College of Music, he was also associated with the Music Faculty at University of Cambridge.
Pauer's interest in early keyboard music and historically informed performance was reflected in his numerous editions. He and he was also active as an author and arranger. He retired in 1896 to Jugenheim in Germany, where he died.