  I review the calculation of the glueball spectrum in non-supersymmetric
Yang-Mills theory (in 3 and 4 dimensions) using the conjectured duality between
supergravity and large N gauge theories. The glueball masses are obtained by
solving the supergravity wave equations in a black hole geometry. The masses
obtained this way are in unexpectedly good agreement with the available lattice
data, and are much better than strong-coupling expansion results. I also show
how to use a modified version of the duality to calculate the glueball mass
spectrum with some of the Kaluza-Klein states of the supergravity theory
decoupled from the spectrum.
