Francis Louis Halzen (born 23 March 1944 in Tienen, Belgium) is a Belgian-American particle physicist, known for the development of the IceCube Neutrino Observatory at the Amundsen-Scott South Pole Station in Antarctica which has been operational since 2010.
Halzen graduated from the University of Louvain (UCLouvain) with a MSc Physics degree in 1966, then a PhD in 1969.
Between 1969-1971 he worked as a scientific associate at CERN. Since 1972 he has been a professor at the University of Wisconsin-Madison and the principal investigator on the AMANDA and IceCube projects.
- 1994: Fellow of the American Physical Society
- 2013: Breakthrough of the Year Award by the journal Physics World for the first-time discovery of cosmic neutrinos beyond the Milky Way 
- 2015: Balzan Prize
- 2015: European Physical Society Prize for Astroparticle Physics and Cosmology
- "Francis Halzen CV" (PDF). IceCube/University of Wisconsin. Retrieved 4 December 2018.
- "Alan Martin". Fellows Directory. Royal Society. Retrieved 4 December 2018.
- Hamish Johnston (December 13, 2013). "Cosmic neutrinos named Physics World 2013 Breakthrough of the Year". Physics World. Retrieved November 11, 2018.
- "2015 Balzan Prize for Astroparticle Physics including neutrino and gamma-ray observation". International Balzan Prize Foundation. October 2015. Retrieved November 11, 2018.
- "The 2015 EPS HEPP Prizes are announced". European Physical Society. April 14, 2015. Retrieved November 11, 2018.