There has been considerable interest in the chemistry of cyanoborane complexes of N-bases,(2) partly due to their being considered as precursors of boron analogues of amino acids’ and partly due to their potential therapeutic values.(4) However, no report on the cyanoborane complexes of the closely related bases, amine N-oxides, is found in the literature; even attempts to isolate the stable parent compounds, viz., the amine N-oxide-boranes(5,6) have met with either no(5) or little success.(6) We, therefore, report here the synthesis and characterization of some first examples of stable cyanoborane complexes of pyridine N-oxides.