George Nicholas Mehnert (November 3, 1881 – July 8, 1948) was an American wrestler who competed in the 1904 Summer Olympics and 1908 Summer Olympics.
He was born in Newark, New Jersey.
In 1904 he won a gold medal in flyweight category.
Four years later he won a gold medal in freestyle bantamweight category.
In winning the gold medal in 1908 he became the first American to win 2 Olympic gold medals in wrestling, and only one of three.