| Marian Gilman | |
| Fullname: | Marian Ulmer Gilman |
| Strokes: | Backstroke |
| Club: | Neptune Beach Swim Club |
| Birth Date: | July 2, 1914 |
| Birth Place: | Berkeley, California |
| Death Place: | Yuba City, California |
Marian Ulmer Gilman (July 2, 1914 – June 23, 1996), also known by her married name Marian Sharpe, was an American competition swimmer who represented the United States at the 1928 Summer Olympics in Amsterdam. As a 14-year-old, Gilman placed fourth in the event final of the women's 100-meter backstroke with a time of 1:24.2.
Her brother, Ralph Gilman, swam for the United States in the 1936 Summer Olympics.