Renormalons play an important role in connecting non-perturbative power corrections to high-order perturbative predictions in QCD. Associated with branch points in the Borel transform of asymptotic series, they have largely been studied diagrammatically in perturbation theory. Similar statements can be made about instantons, though these have been shown to be non-perturbative saddle points of the path integral. We demonstrate that, in a similar vein, renormalons can be understood as saddle points of the one-loop effective action in the path integral, thereby opening new avenues for probing their existence beyond diagrammatics.
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