| Theobald Rehbaum | |
| Birth Date: | 17 August 1835 |
| Birth Place: | Berlin |
| Death Place: | Berlin |
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Theobald Rehbaum (17 August 1835 – 2 March 1918) was a German violinist, librettist and composer, especially of operas.
Born in Berlin, Rehbaum grew up there and sang as a boy in the Royal . He studied violin and composition with Friedrich Kiel, and composition also with Hubertus Rios. Rehbaum composed several operas and choral works, but was more successful as a librettist, writing librettos for Bernhard Scholz. He also wrote a Bratschenschule zum Selbstunterricht für Violinisten (viola method for self-instruction for violinists) and an autobiography titled Erlebtes und Erstrebtes. He died in Berlin.