The Fleischmann's Yeast Hour was a pioneering musical variety radio program broadcast on NBC from 1929 to 1936, when it became The Royal Gelatin Hour, continuing until 1939. This program was sponsored by Fleischmann’s Yeast, a popular brand of yeast.

Fleischmann's Yeast is an American brand of yeast founded by Hungarian-American businessman Charles Louis Fleischmann. It is currently owned by Associated British Foods and is sold to both consumer and industrial markets in the United States and Canada.