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Gauge-invariant effective gluon mass from the operator-product expansion.

We use the operator-product expansion to find the coefficient of {l angle}{ital G}{sup 2}{r angle} in Cornwall's minimally gauge-dependent effective gluon propagator to lowest order in {alpha}{sub {ital s}}. This contribution to the propagator is explicitly shown to be gauge invariant. The running mass generated by this condensate is obtained to be {ital m}{sub gluon}{sup 2}{approx}(640 MeV){sup 4}/{ital Q}{sup 2}. Quark condensate effects are insignificant.