  We prove an $\mathbb F_p$-Selberg integral formula, in which the $\mathbb
F_p$-Selberg integral is an element of the finite field $\mathbb F_p$ with odd
prime number $p$ of elements. The formula is motivated by analogy between
multidimensional hypergeometric solutions of the KZ equations and polynomial
solutions of the same equations reduced modulo $p$.
