| Mary Ann Nyberg | |
| Other Names: | Mary Anne Nyberg |
| Birth Date: | 7 February 1923 |
| Birth Place: | Tulsa, Oklahoma, U.S. |
| Death Place: | Montreal, Quebec, Canada |
| Occupation: | Costume designer |
| Years Active: | 1953–1955 |
| Spouse: | Arthur Knight (19??-1979; her death) |
Mary Ann Nyberg (February 7, 1923 – September 19, 1979) was an American costume designer who was nominated for two Academy Awards.
Both nominations were in the category of Best Costumes-Color.