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The title compound, [Co(C14H17N5)(C6H7N)](C24H20B) or [Co{(pyrrole)2dien}(4-Mepy)]BPh4 where (pyrrole)2dien is 2,2′-[(3-azapentane-1,5-diylbis(nitrilomethylidyne)]dipyrrole and 4-Mepy is 4-methylpyridine, contains a pentadentate (pyrrole)2dien ligand furnishing an N5 set, such that two of the pyrrole N atoms and two of the dien N atoms occupy the equatorial positions while one of the imine N atoms of the (pyrrole)2dien ligand occupies the axial position. The 4-methylpyridine ligand occupies an axial position trans to one of the imine N atoms of the pentadentate ligand. In the observed conformation of the pentadentate ligand, the pyrrole rings attain asymmetrical positions owing to the structural demands. The geometry of the resulting CoN6 coordination can be described as distorted octahedral.