Murphy's Laws starting with D (43 laws)
- Darrow's Observation
- Darwin's Observation
- Dave's Law of Advice
- Dave's Rule of Street Survival
- Davidson's Maxim
- Davis's Basic Law of Medicine
- de la Lastra's Law
- de la Lastra's Corollary
- Deadlock's Law
- Deadlock's Law Corollary
- Dean's Law of the District of Columbia
- Decaprio's Rule
- Deitz's Law of Ego
- Dennis's Principles of Management by Crisis
- Dennis's Principles of Management by Crisis
- Dennis's Principles of Management by Crisis
- Dennis's Principles of Management by Crisis
- Dhawan's Laws for the Non-Smoker
- Dhawan's Laws for the Non-Smoker
- Dhawan's Laws for the Non-Smoker
- Dhawan's Laws for the Non-Smoker
- Dieter's Law
- Dijkstra's Prescription for Programming Inertia
- Diogenes's First Dictum
- Diogenes's Second Dictum
- Dirksen's Three Laws of Politics
- Dirksen's Three Laws of Politics
- Dirksen's Three Laws of Politics
- Donohue's Law
- Donsen's Law
- Douglas's Law of Practical Aeronautics
- Dow's Law
- Dror's First Law
- Dror's Second Law
- Ducharme's Precept
- Dude's Law of Duality
- Dunne's Law
- Dunn's Discovery
- Durant's Discovery
- Durrell's Parameter
- Dyer's Law
- Dean Martin's Definition of Drunkenness
- Dolly Parton's Principle
