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- Nachbin's theorem(complex analysis)
- Nagata's compactification theorem (algebraic geometry)
- Nagata–Smirnov metrization theorem(general topology)
- Nagell–Lutz theorem (elliptic curves)
- Napoleon's theorem (triangle geometry)
- Nash embedding theorem (differential geometry)
- Nash–Moser theorem (mathematical analysis)
- Newlander–Niremberg theorem (differential geometry)
- Newton's theorem about ovals (curves)
- Nicomachus's theorem (number theory)
- Nielsen fixed-point theorem (fixed points)
- Nielsen realization problem (geometric topology)
- Nielsen–Schreier theorem (free groups)
- No cloning theorem (quantum computation)
- No free lunch theorem (philosophy of mathematics)
- No hair theorem (physics)
- No wandering domain theorem (ergodic theory)
- No-broadcast theorem (physics)
- No-communication theorem (physics)
- Noether's theorem (Lie groups, calculus of variations, differential invariants, physics)
- Noether's second theorem (calculus of variations, physics)
- Noether's theorem on rationality for surfaces (algebraic surfaces)
- Goddard–Thorn theorem (vertex algebras)
- No-trade theorem (economics)
- Non-squeezing theorem (symplectic geometry)
- Norton's theorem (electrical networks)
- Novikov's compact leaf theorem (foliations)
- Nyquist–Shannon sampling theorem (information theory)
Read more about this topic: List Of Theorems