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- William Damon, author, psychologist, and Stanford University educator (graduated 1963)
- Lucy Danziger, Editor in Chief of SELF Magazine (graduated 1978)
- John Darnton, Pulitzer Prize-winning foreign correspondent for the New York Times (graduated 1960
- Benjamin Darrow, New York District Attorney (graduated 1879)
- Justin Whitlock Dart, Jr., advocate for rights of disabled people (graduated 1949)
- Jonathan Dee, author (graduated 1980)
- Dana Delany, actress (graduated 1974)
- Zak DeOssie, football player for the New York Giants (graduated 2003) Super Bowl winning long snapper
- Warren Fales Draper (publisher), 1843 graduate who was a significant donor of the school; Draper Hall and Draper Cottage are named for him
- Bill Drayton, noted entrepreneur who coined the phrase social entrepreneur.
- Teddy Dunn, actor (graduated 1999)
Read more about this topic: List Of Phillips Academy Alumni