Daniel J. Lally (August 12, 1867 – April 14, 1936), was a Major League Baseball outfielder.

He played for the 1891 Pittsburgh Pirates and 1897 St. Louis Browns of the National League.

In addition to his two brief appearances in the Majors, he had an extensive minor league baseball career that lasted from 1887 through 1905.

Dan spent most of his later years in various institutions, including the Wisconsin State Asylum.

This biographical article relating to an American baseball outfielder born in the 1860s is a stub.