Here is a list of composers with pages at IMSLP who were or are Jewish. In compiling this list, I included a composer if one of his or her parents were Jewish, even if they converted to another religion. On the other hand, if I couldn't find definite documentation that a composer was Jewish, even though there was strong circumstantial evidence, I did not include the composer.
Finally, I added notes in cases where I knew something about the composer; specifically,
I have, of course, missed many. Feel free to correct or add to the list.
Category:Achron, Joseph (Petersburg)
Category:Adler, Simon (Jewish content)
Category:Alkan, Charles-Valentin (Jewish content - liturgical)
Category:Bloch, Ernest (Jewish content)
Category:Bosmans, Henriëtte (Jewish content)
Category:Engel, Joel (Petersburg)
Category:Erlanger, Camille (Jewish content)
Category:Ernst, Heinrich Wilhelm (Jewish content)
Category:Gernsheim, Friedrich (Jewish content)
Category:Gnesin, Mikhail (Petersburg)
Category:Goldmark, Rubin (Jewish content)
Category:Haas, Pavel (Suppressed)
Category:Halévy, Fromental (Jewish content)
Category:Hast, Marcus (liturgical)
Category:Helfman, Max (Jewish content - liturgical)
Category:Hiller, Ferdinand (Jewish content)
Category:Hirsch, Louis Achille
Category:Idelsohn, Abraham Zevi (Petersburg)
Category:Joachim, Joseph (Jewish content)
Category:Klebanov, Dmytro (Jewish content (Babi Yar) but not on IMSLP)
Category:Koffler, Józef (Holocaust victim)
Category:Korngold, Erich Wolfgang (Suppressed)
Category:Krein, Aleksandr (Petersburg)
Category:Lewandowski, Louis (liturgical)
Category:Manasse, Otto (Holocaust victim)
Category:Milner, Moses Michael (Petersburg)
Category:Moscheles, Ignaz (Jewish content)
Category:Nathan, Isaac (Jewish content)
Category:Naumbourg, Samuel (Jewish content - liturgical)
Category:Ornstein, Leo (Jewish content)
Category:Rosenberg-Ružić, Vjekoslav
Category:Rossi, Salamone (Jewish content)
Category:Rothschild, Charlotte de
Category:Rothschild, Mathilde de
Category:Rubinstein, Anton (Jewish content)
Category:Sabin, Wallace Arthur (Liturgical)
Category:Salaman, Charles Kensington
Category:Saminsky, Lazare (Petersburg)
Category:Schoenberg, Arnold (Jewish content)
Category:Schulhoff, Erwin (Holocaust victim)
Category:Schreker, Franz (Suppressed)
Category:Seligmann, Hippolyte Prosper
Category:Sekles, Bernhard (Suppressed)
Category:Sinigaglia, Leone (Holocaust victim)
Category:Smit, Leo (Holocaust victim)
Category:Steinberg, Maksimilian
Category:Sulzer, Salomon (liturgical)
Category:Toch, Ernst (Suppressed)
Category:Translateur, Siegfried (Suppressed)
Category:Veprik, Aleksandr (Petersburg)
Category:Waghalter, Ignatz (Suppressed)
Category:Weigl, Karl (Suppressed)
Category:Weill, Kurt (Suppressed)
Category:Weis, Karel (opera Polnische Jude)
Category:Wellesz, Egon (ancestors only)
Category:Willner, Arthur (Suppressed)
Category:Yafil, Edmond-Nathan (Arabic music)
Category:Zeitlin, Leo (Petersburg)
Category:Zemlinsky, Alexander von (Suppressed)
