Robert Lienau (1838-1920) was a German music sheet publisher, who in 1864 acquired the publishing firm founded by Adolf Martin Schlesinger in Berlin in 1810, and gave the company his own name. He moved the main offices of the firm to Frankfurt am Main.
The firm Robert Lienau issued the works of leading composers such as Anton Bruckner, Jean Sibelius, Leopold Godowsky and Alban Berg. Lienau’s lobbying on the issue of musical copyright influenced the new copyright laws of the German Reich of 1901. In 1990 the company merged with the publisher Zimmermann.