Ira B. Arnstein (born Itzig Arenstein April 12, 1879 – September 13, 1956) was a musical composer, songwriter, and "chronic litigator".

He composed mainly "parlor piano pieces and Yiddish songs", once writing a Jewish national anthem entitled "Soldiers of Zion".

[3][4] It was noted that Arnstein experienced "copyright infringement persecution mania", always certain that others were stealing his work.

[2] Arnstein sued Cole Porter, Irving Berlin and Twentieth Century-Fox, among others, for copyright infringement.

[1] In 1946, the Second Circuit court granted Arnstein’s appeal in a suit against Cole Porter.