Dennis Mendyk (born 1934/1935), also known as Dennis the Menace and Dennis the Mennis, is an American football and baseball player.
Mendyk was the son of Clarence Mendyk. He attended Michigan State University.
Mendyk played for the Michigan State Spartans football team in 1956. The next year, he was selected by the New York Giants in the 3rd round of the 1957 NFL Draft; he did not make the final roster.
Mendyk played in Minor League Baseball from 1957 to 1960.