| Rudolf Löb | |
| Birth Date: | 21 November 1877 |
| Birth Place: | Elberfeld, Prussia |
| Death Place: | Boston, Massachusetts, United States |
| Occupation: | Banker |
| Employer: | Mendelssohn & Co. |
| Nationality: | German Empire |
Rudolf Löb (November 21, 1877 – January 30, 1966) was a German banker with Mendelssohn & Co. and consultant to the German and Russian governments.
Löb became personal liable partner with Mendelssohn & Co. in 1919. Following the death of Franz von Mendelssohn and Paul von Mendelssohn-Bartholdy in 1935, Löb was appointed as chairman of Mendelssohn & Co. bank as the first non-family member. In the 1930s, he served as the Belgian General Consul in Berlin. In 1938, he was pressured by the Nazis' Aryanisation policy to break up Mendelssohn & Co. and hand over most of its assets to Deutsche Bank. Löb emigrated to Argentina in 1939 and to the United States in 1948. He died on January 30, 1966.