The term Weil conjecture may refer to:
- The Weil conjectures about zeta functions of varieties over finite fields, proved by Dwork, Grothendieck, Deligne and others.
- The Taniyama–Shimura–Weil conjecture about elliptic curves, proved by Wiles and others.
- The Weil conjecture on Tamagawa numbers about the Tamagawa number of an algebraic group, proved by Kottwitz and others.
- The Hasse–Weil conjecture about zeta functions.
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