Oscar Hammerstein I | |
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 Portrait from Who's Who on the Stage, 1906 | |
| Born | 8 May 1846 |
| Died | 1 August 1919 (aged 73) |
| Occupation(s) | Businessman, composer, theater impresario |
| Children | |
| Relatives | Oscar Hammerstein II (grandson) Elaine Hammerstein (granddaughter) James Hammerstein (great-grandson) |
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Oscar Hammerstein I (8 May 1846 – 1 August 1919) was a German-born businessman, theater impresario, and composer in New York City. His passion for opera led him to open several opera houses, and he rekindled opera's popularity in America. He was the grandfather of American playwright/lyricist Oscar Hammerstein II and the father of theater manager William Hammerstein and American producer Arthur Hammerstein.