Mary Elizabeth Pipher, also known as Mary Bray Pipher, is an American clinical psychologist and author. Her notable works include A Life in Light: Meditations on Impermanence (2022) and Women Rowing North (2019), a book focused on aging gracefully. Other prominent publications are The Green Boat: Reviving Ourselves in Our Capsized Culture (2013) and the bestseller Reviving Ophelia: Saving the Selves of Adolescent Girls (1994).

Pipher earned a Bachelor of Arts degree in anthropology from the University of California, Berkeley in 1969 and a PhD in clinical psychology from the University of Nebraska–Lincoln in 1977. She was honored as a Rockefeller Scholar in Residence at Bellagio in 2001 and received two American Psychological Association Presidential Citations. In 2006, she returned one of these citations as a protest against the APA's acknowledgment of certain controversial interrogation techniques used by its members.

Active in local politics, Pipher frequently contributes to the Nebraska state legislature discussions and writes letters to the editor of the Lincoln Journal Star. She has written for The New York Times about the political landscape of Nebraska, advocating for progressive change. Pipher is a vocal opponent of the Keystone XL Pipeline and supported Nebraska Legislative Bill 802, aimed at addressing climate change issues.

As of 2019, she resides in Lincoln, Nebraska.