Samuel D. Johnson, Jr. (November 17, 1920 – July 27, 2002) was a United States federal judge.Born in Hubbard, Texas, Johnson was in the United States Army Private during World War II, from 1942 to 1945. He received a B.B.A. from Baylor University in 1946 and an LL.B. from the University of Texas School of Law in 1949. He was in private practice in Hillsboro, Texas from 1949 to 1953. He was a County attorney of Hill County, Texas from 1953 to 1955.