The imaging of hydrodynamic conditions at an electrode surface by a new method based on the electrochemiluminescence of luminol has been demonstrated. The technique allows the mapping of local mass transfer coefficients, localised hydrodynamic disturbances and the effects of approaching gas bubbles to electrode surfaces by light emission contrasts obtained with a transparent electrode. These can be used to assess the evolution of hydrodynamic instabilities and the effects of bubble penetration in the near-wall region.