Yang Yang (simplified Chinese: 杨阳; traditional Chinese: 楊陽; pinyin: Yáng Yáng; born 1958) is a Taiwanese-American materials scientist. He is a Professor of Materials Science and Engineering, and Professor of Bioengineering at the University of California, Los Angeles, where he holds the Carol and Lawrence E. Tannas Jr. Endowed Chair in Engineering. Yang is known for his contributions to polymer organic solar cells and lead-halide perovskite solar cells. He was named as one of the "World’s Most Influential Scientific Minds" by Thomson Reuters in 2016. Yang is a fellow of the American Association for the Advancement of Science, American Physical Society, Materials Research Society, Royal Society of Chemistry, and Society of Photo-Optical Instrumentation Engineers.