**Dirac** may refer to:

- People

- Paul Dirac (1902–1984), Swiss-British theoretical physicist, Nobel laureate, and a founder of the field of quantum physics
- Gabriel Andrew Dirac (1925–1984), graph theorist, Paul Dirac's stepson

- In physics

- Dirac bracket, a generalization of the Poisson bracket
*Dirac constant*, a reduced form of the Planck constant- Dirac delta function, a generalized mathematical function
- Dirac equation, a relativistic quantum mechanical wave equation
- Dirac notation, a standard notation for describing quantum states
- Fermi–Dirac integral (disambiguation)
- Fermi–Dirac statistics, used to describe energies of single particles that obey the Pauli exclusion principle

- Other

- 5997 Dirac, a main-belt asteroid
- Dirac (software), a relativistic quantum chemistry program
- Dirac (video compression format), an open digital video codec developed by BBC Research
- Dirac, Charente, a commune of the Charente
*département*, in France - Dirac measure, a mathematical measure that is a probability measure

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