Robert Nelson Cornelius Nix Jr. served as the chief justice of the Pennsylvania Supreme Court from 1984 to 1996. Nix was the first African-American Chief Justice of any state's highest court, and the first African American to be elected to statewide office in Pennsylvania. He served as a justice of the Supreme Court of Pennsylvania for 24 years, 12 of which were as chief justice, and was a prominent figure in Pennsylvania law and public service for more than three decades.

Robert Nelson Cornelius Nix Sr. was an American politician who served in the United States House of Representatives from 1958 until 1979. He was the first African American to represent Pennsylvania in the House of Representatives. The Robert N. C. Nix Federal Building in Philadelphia, Pennsylvania is named in his honor.