- Davis, Jefferson - President of the Confederate States of America
- Dawkins, Richard - British zoologist, author of The Selfish Gene
- Dayton, Sky - Founder of Earthlink and Boingo Wireless
- De Niro, Robert - American Oscar-winning actor, starred in Raging Bull and Godfather II
- De Soto, Hernando - Economist, founder of Instituto Libertad y Democracia
- DeMille, Nelson - American bestselling mystery writer
- Dell, Michael - Founder and chairman of Dell, Inc.
- Demento, Dr. - Radio DJ, hosts two-hours of "mad music and crazy comedy"
- Deming, W. Edwards - 20th century American statistician
- Devanter, Willis Van - Associate Justice of the U.S. Supreme Court in the early 20th century
- DiLorenzo, Thomas J. - Professor of economics and author
- Directors and Producers - Film, TV and stage directors, producers and other crew
- Dixon, Michael - Management consultant, national chair of the U.S. Libertarian Party (2004- )
- Dooling, Richard - American novelist, co-writer of Stephen King's "Kingdom Hospital" TV miniseries
- Douglas, Melvyn - American stage and movie actor, winner of Oscar, Tony and Emmy awards
- Douglass, Frederick - 19th century American abolitionist, known for his autobiography as a slave
- Downs, Hugh - Past host of the ABC News "20/20" newsmagazine, radio commentator for "Perspectives"
- Dreyfuss, Richard - American actor, winner of Oscar for The Goodbye Girl
- Drolet, Leon - State representative in the Michigan House of Representatives
- Drucker, Peter F. - 20th century Austrian-born American author and professor of management
- Drudge, Matt - Pioneer of Internet journalism, author of the "Drudge Report" news website
- Dunaway, Faye - American movie actress, winner of Best Actress Oscar for Network
- Dyson, Esther - Editor at large at CNET Networks, editor of technology newsletter Release 1.0
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