Claude Allen Porter Turner (July 4, 1869 – January 10, 1955) was an American structural engineer who designed a number of buildings and bridges, particularly in the midwestern U.S. states of Iowa, Minnesota, and Wisconsin.Turner was born in Lincoln, Rhode Island and attended Lehigh University's school of engineering in Bethlehem, Pennsylvania, graduating in 1890. He worked for several companies in the Eastern United States before moving to Minneapolis, Minnesota in 1897.