Estel S. "Zit" Tessmer (February 25, 1910 – June 1972) was an American football and basketball player. A native of Ann Arbor, Michigan, Tessmer attended the University of Michigan where he played for the football and basketball teams. He played as a quarterback for the Michigan Wolverines football teams from 1929 to 1931 and 1933. He won the Chicago Alumni Trophy as a freshman in football. He started three games at the quarterback position in 1930 and three more in 1931, but his playing time at quarterback was limited because the 1930 and 1931 Wolverines included College Football Hall of Fame quarterback Harry Newman. After losing the starting quarterback job to Newman, Tessmer also played some games at the right halfback position. Tessmer also played three years as a guard for the Michiga