Theodor W. Hänsch, German physicist and academic, Nobel Prize laureate
Theodor Wolfgang Hänsch (German pronunciation: [ˈteːodoːɐ̯ ˈhɛnʃ] (listen); born 30 October 1941) is a German physicist. He received one fourth of the 2005 Nobel Prize in Physics for "contributions to the development of laser-based precision spectroscopy, including the optical frequency comb technique", sharing the prize with John L. Hall and Roy J. Glauber.

Hänsch is Director of the Max-Planck-Institut für Quantenoptik (quantum optics) and Professor of experimental physics and laser spectroscopy at the Ludwig-Maximilians University in Munich, Bavaria, Germany.