Robert Nix may refer to:
- Robert N.C. Nix, Sr. (1905–1987), Congressman from Pennsylvania
- Robert N. C. Nix, Jr. (1928–2003), Pennsylvania Supreme Court justice
- Robert N.C. Nix, Sr. Federal Building, formerly known as the U.S. Courthouse and Post Office Building in Philadelphia, listed on the National Register of Historic Places
- Robert Nix, drummer for The Candymen and Atlanta Rhythm Section