Samuel D. Johnson Jr. (November 17, 1920 – July 27, 2002) was a United States federal judge of the United States Court of Appeals for the Fifth Circuit.
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. He was a District attorney of Hillsboro, Texas from 1955 to 1959. He was a judge on the District Court, 66th Judicial District from 1959 to 1965. He was a Director, Houston Legal Foundation, Houston, Texas from 1965 to 1967. He was a judge on the 14th Court of Appeals, State of Texas from 1967 to 1973. He was an Associate justice, Supreme Court of Texas from 1973 to 1979.
Johnson was a federal judge on the United States Court of Appeals for the Fifth Circuit. Johnson was nominated by President Jimmy Carter on August 10, 1979, to a new seat created by 92 Stat. 1629. He was confirmed by the United States Senate on October 4, 1979, and received his commission on October 5, 1979. He assumed senior status on May 10, 1991. Johnson served in that capacity until his death on July 27, 2002.