Daniel Maurice Casey (November 20, 1862 – February 8, 1943) was an American professional baseball player whose career spanned from 1884 to 1894 and 1899. He played in Major League Baseball, principally as a pitcher, over parts of seven seasons for four major league clubs. He saw his most extensive playing time with the Philadelphia Quakers, appearing in 142 games for that team from 1886 to 1889. He also appeared in 46 games for the Syracuse Stars in 1890.