In this talk we discuss the impact of topological QCD vacuum fields
on the low-lying glueball spectrum. In particular, we show that an 
essential part of the pertinent nonperturbative information can be 
obtained analytically and model-independently by combining a non-
perturbative operator product expansion and dispersive sum-rule
techniques. 

The topological physics turns out to have crucial impact on a rather
diverse pattern of glueball properties. We present new predictions 
for the spin-0 glueball masses and decay constants, estimate the 
scalar glueball width, and discuss several implications for glueball
structure and experimental glueball searches.