Charles Masamed Marcus (born October 8, 1962) is an American physicist and professor. Currently a professor at the University of Washington and the Niels Bohr Institute, he previously worked at both Stanford and Harvard universities. He was elected to the National Academy of Sciences in 2018 for his contributions to condensed matter and mesoscopic physics. He has also been recognized with the H. C. Ørsted Gold Medal for his contributions to quantum computing, spin qubits, and superconducting qubits.