Rónadh Cox (born 1962) is an Irish geologist who is the Edward Brust Professor of Geology and Mineralogy at Williams College, Massachusetts.

She is a Member of the Royal Irish Academy and a Fellow of both the Geological Society of America and the American Association for the Advancement of Science.

She moved to the United States for her graduate research, joining Stanford University as a doctoral student.

[2] Cox joined the faculty at Williams College in 1996, and was eventually promoted to Edward Brust Professor of Geology and Mineralogy.

[2] She has studied the impact of strong storms (some equivalent to category 3 hurricanes) on Ireland's west coast, with focus on the Aran Islands.