Mary Logan Reddick (December 31, 1914 – October 1, 1966) was an American neuroembryologist who earned her PhD from Radcliffe College, Harvard University in 1944.

Her doctoral dissertation was on the study of chick embryos,[1] and she went on to do research with time-lapse microscopy (then called motion picture microphotography) in tissue cultures.

[3] Reddick was possibly the first African-American woman scientist to receive this fellowship for study abroad, and she was the first female biology instructor at Morehouse College.

[1] In 1937, she received a Rockefeller Foundation General Education Board Fellowship, enabling her to gain a Masters of Science degree from the University of Atlanta, with a thesis studying the embryo chick blastoderm.

[3] Reddick studied techniques for transplanting tissues and nerve cell differentiation in chick embryos there for two years, gaining a second master's degree in biology in 1943 and being awarded a PhD in 1944.

[7] The goal of her experiments was to understand how much of that area of the brain was already determined and how much was dependent on interactions with surrounding developing tissues, such as notochord, somites, and ectoderm.

[7] The results of these experiments supported the hypothesis that while some aspects of the post-otic medulla in chick have already been determined, there needs to be a continuous interaction with surrounding developing tissues.

[8] To try to get single developing nerve cells with long processes visible in one plane of focus under the microscope, Reddick used a "smear" technique of flattening tissue before fixing and staining it.