| John Mathias | |
| Full Name: | John Gilbert Mathias Jr. |
| Birth Date: | 26 January 1949 |
| Birth Place: | Buffalo, New York, U.S. |
| Classes: | Flying Dutchman |
| Show-Medals: | yes |
John Gilbert Mathias Jr. (born January 26, 1949) is an American sailor. He competed in the Flying Dutchman event at the 1976 Summer Olympics.[1]