Daniel Chee Tsui (Chinese: 崔琦; pinyin: Cuī Qí, born February 28, 1939) is an American physicist.

[1] Tsui's areas of research include electrical properties of thin films and microstructures of semiconductors and solid-state physics.

Tsui won the Nobel Prize in Physics of 1998 with Robert B. Laughlin and Horst L. Störmer "for their discovery of a new form of quantum fluid with fractionally charged excitations.

Upon graduating in 1957, Tsui was admitted to the National Taiwan University Medical School, but due to uncertainties over whether he would be able to return to his family in China, he remained in Hong Kong to enroll in Special Classes Centre, a special two-year government program intended to prepare high school graduates for entrance into the University of Hong Kong.

While preparing for the entrance examination to the University of Hong Kong in spring of 1958, Tsui was awarded a full scholarship to attend Augustana College, his church pastor's Lutheran alma mater in the United States.