Many industrial processes generate “oily wastewaters”, characterized by low volume fractions of micrometer-scale, oil-in-water droplets that are difficult to separate by mechanical or chemical means. High dc voltages are traditionally applied for the electrical demulsification of water-in-oil emulsions. In this work, we demonstrate that oil-in-NaOH contaminated wastewater emulsions respond to low-voltage, low-frequency oscillatory fields by aggregating near the electrodes. Optical microscopy shows that droplets initially separate upon the application of an ∼10 Hz oscillatory field but slowly form aggregates over longer time scales of several minutes. The rate of aggregation varies nonmonotonically with the applied field strength, exhibiting a peak near 3 Vpp and decreasing at higher strengths. Finally, we demonstrate that a combination of low-frequency fields with a small dc offset induces coalescence to break the emulsion. These results point toward a low-energy, nonchemical method for recovering oils from oily wastewaters.