| Daniel Bennett St. John Roosa | |
| Birth Date: | 1838 |
| Birth Place: | Bethel, New York, United States |
| Death Date: | 1908 |
| Education: | Medical College of New York University (Graduated 1860) |
| Occupation: | Physician |
| Work Institutions: | NewYork-Presbyterian Hospital Manhattan Eye, Ear and Throat Hospital |
| Years Active: | 1860s–1908 |
| Profession: | Surgeon |
Daniel Bennett St. John Roosa (1838–1908) was an American physician born in Bethel, New York.
He graduated in 1860 from New York's University Medical College. He was assistant surgeon in the Fifth New York Volunteers' three-months troops, became resident surgeon at the New York Hospital in 1862, and in 1864 began practice in New York City.
He was one of the founders of Manhattan Eye, Ear and Throat Hospital. From 1863 to 1882, he was a professor of diseases of the eye and ear at his alma mater, and from 1875 to 1880 held a similar chair at the University of Vermont (Burlington). In 1888, he was appointed professor of diseases of the eye in the New York Post-Graduate Medical School, of whose faculty he would become president.
He wrote: