Sang-Wook Cheong (Korean: 정상욱) is an American materials scientist at Rutgers University.

[1] He has made ground-breaking contributions[1] to the research field of enhanced physical functionalities in complex materials originating from collective correlations and collective phase transitions such as colossal magnetoresistive and colossal magnetoelectric effects in complex oxides.

He has also made pivotal contributions to mesoscopic self-organization in solids, including the nanoscale charge stripe formation, mesoscopic electronic phase separation in mixed valent transition metal oxides, and the formation of topological vortex domains in multiferroics, which was found to be synergistically relevant to mathematics (graph theory) and cosmology.

Cheong graduated in Mathematics from Seoul National University in 1982 and then studied physics in the University of California, Los Angeles, graduating from there in 1989.

He was appointed as a Professor at Rutgers University in 1997 and founded the Rutgers Center for Emergent Materials (RCEM) in 2005.