Leo Paul Kocialkowski (August 16, 1882 – September 27, 1958) was an American politician who served five terms as a Democratic U.S. Representative from Illinois from 1933 to 1943.

Kocialkowski was elected as a Democrat to the Seventy-third and to the four succeeding Congresses (March 4, 1933 – January 3, 1943).

He served as chairman of the Committee on Insular Affairs (Seventy-fourth through Seventy-seventh Congresses).

He served as member of the Civil Service Commission of Cook County, Illinois from 1945 to 1949.

This article incorporates public domain material from the Biographical Directory of the United States Congress