- Design evolution of the Citadel
- Desk Employee
- Developer commentary
- Development History of Portal
- Development of Half-Life 2
- Development of the next Half-Life game
- Dhabih Eng
- Digger
- Directed Design Experiments
- Displacer Cannon
- Dock 137
- Dog
- Door Tower
- Doug Lombardi
- Doug Rattmann
- Douglas R. Wood
- Dr. Breen's Private Reserve
- Drawbridge
- Dreamcast items
- Drillpress
- Duncan and Scooter
- Dunn
- Dwight T. Barnes
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