Elimelech Gavriel "Mike" Tress (1909 – July 9, 1967) was a Jewish American who served as the national president of Agudath Israel of America from the 1940s until his death. He was a major figure in the movement's expansion and its chief lay leader until his death. Tress was the son of an immigrant and born in the United States. Without training to become a rabbi, he was later titled as 'Reb Elimelech' due to his influential work. He was also known by his nickname "Mike". Before and during the Second World War, he founded various youth organizations to counteract assimilation.