Lagrange's identity may refer to:
- Lagrange's identity, an algebraic identity
- Lagrange's identity (boundary value problem), an identity in calculus
- Lagrange's trigonometric identities, two trigonometric identities
- Lagrange's four-square theorem, a theorem from number theory
- Lagrange polynomial for theorems relating to numerical interpolation
- Euler–Lagrange equation of variational mechanics
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