Wendy Laurel Freedman FRS (born July 17, 1957) is a Canadian-American astronomer, best known for her measurement of the Hubble constant, and as director of the Carnegie Observatories in Pasadena, California, and Las Campanas, Chile.

[8] Freedman's early work was principally on the Cepheid distance scale and the stellar populations of nearby galaxies.

She continues to refine her measurements of the Hubble constant using not just Cepheid variables but also the method of the tip of the red-giant branch.

[10] Freedman initiated the Giant Magellan Telescope (GMT) Project and served as chair of the board of directors from its inception in 2003 until 2015.

With a primary mirror 80 feet (24 meters) in diameter, the GMT is poised to be the world's largest ground-based telescope when it is completed.

[17] She received the 2016 Dannie Heineman Prize for Astrophysics,[18] awarded jointly by the American Institute of Physics and the American Astronomical Society, "for her outstanding contributions and leadership role in using optical and infrared space- and ground-based observations of Cepheid stars, together with innovative analysis techniques, to greatly improve the accuracy of the cosmic distance scale and thereby constrain fundamental cosmological parameters.