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- Wagner's theorem (graph theory)
- Waldhausen's theorem (geometric topology)
- Walter theorem (finite groups)
- Weber's theorem (algebraic curves)
- Wedderburn's little theorem (ring theory)
- Wedderburn's theorem (abstract algebra)
- Weierstrass–Casorati theorem (complex analysis)
- Weierstrass factorization theorem (complex analysis)
- Weierstrass preparation theorem (several complex variables,commutative algebra)
- Weinberg–Witten theorem (quantum field theory)
- Well-ordering theorem (mathematical logic)
- Whitehead theorem (homotopy theory)
- Whitney embedding theorem (differential manifolds)
- Whitney extension theorem (mathematical analysis)
- Whitney immersion theorem (differential topology)
- Whitney–Graustein Theorem (algebraic topology)
- Wick's theorem (physics)
- Wiener's tauberian theorem (real analysis)
- Wiener–Ikehara theorem (number theory)
- Wigner–Eckart theorem (Clebsch–Gordan coefficients)
- Wilkie's theorem (model theory)
- Wilson's theorem (number theory)
- Witt's theorem (quadratic forms)
- Wold's theorem (statistics)
- Wolstenholme's theorem (number theory)
Read more about this topic: List Of Theorems