Richard A. Dier (February 27, 1914 – December 7, 1972) was a United States federal judge.
Born in Exeter, Nebraska, Dier received a B.S. from the University of Nebraska in 1935 and an M.A. from the University of Nebraska in 1941. He was in the United States Army during World War II, from 1941 to 1946. After the war, he received an LL.B. from Washington University School of Law in 1948, and was in private practice in Kearney, Nebraska from 1948 to 1969. He was a city attorney of Kearney from 1949 to 1951. He was a deputy county attorney of Buffalo County, Nebraska from 1954 to 1958. He was the United States Attorney for the District of Nebraska from 1969 to 1971.
On December 2, 1971, Dier was nominated by President Richard Nixon to a seat on the United States District Court for the District of Nebraska vacated by Richard E. Robinson. Dier was confirmed by the United States Senate on December 6, 1971, and received his commission on December 9, 1971. Dier served in that capacity until his death, in 1972.