Aqueous, 0.1M 1,1,3,3-tetramethylguanidine was shown to be an active alkaline liquid electrolyte (without metal cations) using a polycrystalline platinum electrode. Cyclic voltammetry reveals that the electrolyte supports -OH conductivity, showing many platinum redox features observed in traditional electrolytes. Gradual reaction with H2O decreases ionic conductivity over several months. Oxygen reduction curves in TMG lack a distinct transition from kinetic to diffusion-limiting behavior due to organic adsorbates. Results ultimately show that tetramethylguanidine could be developed as an alternative to NaOH/KOH for enhancing ionic conductivity of alkaline anion exchange membranes of similar composition. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.009203esl] All rights reserved.