Most in the world of power quality are familiar with the concept of resonance in an electrical network as well as the methods for dealing with the issues and byproducts of resonances. Ferroresonance, on the other hand, is less well-known, the results of which can lead to significant issues including distribution equipment failure. This whitepaper aims to give a high-level overview of ferroresonance, and how to potentially identify this anomaly when it presents itself in a power quality recording.