Stephan Ley (29 November 1867 – 30 May 1964 in Bonn) was a German music educator, Beethoven researcher and musicologist.
He then returned to teaching and taught at grammar schools in Wipperfürth, (Oberbergischer Kreis) and Linz am Rhein.
Ley published six highly acclaimed books and a total of 85 essays on Ludwig van Beethoven.
For his great services to Beethoven research he was awarded the Bundesverdienstkreuz first class by the then Federal President Theodor Heuss in 1958.
Ley died at the age of 96 and found his final resting place at the Alter Friedhof, Bonn