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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 (mechanics), a relation between coordinates and momenta
Constraint (computational chemistry)
Constraint (information theory), the degree of statistical dependence between or among variables
Constraints (journal), a scientific journal
Constraint (database), a concept in relational database

Particular types of constraint

Biological constraints, factors which make populations resistant to evolutionary change
Carrier's constraint on lung function in long thin animals
Finite domain constraint, in mathematical solution-finding
Integrity constraints in databases
- Check constraint
- Foreign key constraint
Observational constraint in science, a constraint on a solution implied by previous observations
Specific types of mechanical constraints:
- First-class constraint and second-class constraint in Hamiltonian mechanics
- Primary constraint, secondary constraint, etc. in Hamiltonian mechanics
- Holonomic constraints, also called integrable constraints, (depending on time and the coordinates but not on the momenta)
- Nonholonomic constraints
- Pfaffian constraint
- Scleronomic constraint (not depending on time)
- Rheonomic constraint (depending on time)