  As was pointed out by Nikulin [8] and Vinberg [10], a right-angled polyhedron
of finite volume in hyperbolic n-space $\mathbb{H}^n$ has at least one cusp for
$n\geq 5$. We obtain non-trivial lower bounds on the number of cusps of such
polyhedra. For example, right-angled polyhedra of finite volume must have at
least three cusps for $n=6$. Our theorem also says that the higher the
dimension of a right-angled polyhedron becomes, the more cusps it must have.
