Constraint may refer to:
- Constraint (computer-aided design), a demarcation of geometrical characteristics between two or more entities or solid modeling bodies
- Constraint (mathematics), a condition of an optimization problem that the solution must satisfy
- Constraint (classical mechanics), a relation between coordinates and momenta
- Constraint (information theory), the degree of statistical dependence between or among variables
- Constraints (journal), a scientific journal
- Constraint, a concept in relational database
See also
- Biological constraints, factors which make populations resistant to evolutionary change
- Carrier's constraint
- Constrained optimization, in finance, linear programming, economics and cost modeling
- Constrained writing, in literature
- Constraint algorithm, such as SHAKE, or LINCS
- Constraint satisfaction, in computer science
- Finite domain constraint
- First class constraint in Hamiltonian mechanics
- Integrity constraints
- Loading gauge, a constraint in engineering
- Optimality theory, in linguistics, a constraint-based theory which is primarily influential in phonology
- Primary constraint in Hamiltonian mechanics
- Restraint (disambiguation)
- Second class constraint in Hamiltonian mechanics
- Secondary constraint in Hamiltonian mechanics
- Structure gauge, a constraint in engineering
- Theory of constraints, in business management