Frances "Fran" Bagenal (born 4 November 1954) is a Professor Emerita of Astrophysical and Planetary Sciences at the University of Colorado Boulder and a Senior Research Scientist at the Laboratory for Atmospheric and Space Physics in the fields of space plasmas and planetary magnetospheres.

Bagenal is from Dorchester, England, and grew up near Cambridge.

[1] Bagenal has worked on a number of planetary science missions including the Voyager Plasma Science (PLS) experiment, Galileo, Deep Space 1, New Horizons mission to Pluto, and the Juno mission to Jupiter.

[2] Usually in her work on different missions, she is a member of the science team as a plasma scientist.

[1] Bagenal chaired NASA's Outer Planet Assessment Group that provides input from the scientific community on exploration of the outer Solar System.