Chebyshev's theorem is any of several theorems proven by Russian mathematician Pafnuty Chebyshev.

• Bertrand's postulate, that for every n there is a prime between n and 2n.
• Chebyshev's inequality, on the range of standard deviations around the mean, in statistics
• Chebyshev's sum inequality, about sums and products of decreasing sequences
• Chebyshev's equioscillation theorem, on the approximation of continuous functions with polynomials
• The statement that if the function ${\textstyle \pi (x)\ln x/x}$ has a limit at infinity, then the limit is 1 (where π is the prime-counting function). This result has been superseded by the prime number theorem.

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