Judith Viorst (born February 2, 1931) is an American author, newspaper journalist, and psychoanalysis researcher. She is perhaps best known for her children's literature, such as The Tenth Good Thing About Barney (about the death of a pet) and the Alexander series of short books.
In the latter part of the 1970s, after two decades of writing for children and adults, Viorst turned to the study of Freudian psychology. After six years of study at Washington Psychoanalytic Institute, in 1981 she became a research graduate affiliated with the institute.
Judith Viorst lives in Washington, DC, with her husband, political writer Milton Viorst. They have three grown sons: Anthony Jacob Viorst, an attorney practicing in the Denver, Colorado area; Nicholas Nathan "Nick" Viorst, an Assistant District Attorney for New York County, and Alexander Noah Viorst.