The absorption spectra of new crystalline uranyl complexes with pyridine, at 80° Kare described. Pyridine uranyl chloride crystallises in two forms, both forms give sharp line like bands at low temperatures. In Form I the bands are analysed in terms of five electronic transitions F, M, D, U and SU of which the former four were suggested for uranyl ion by Diekeet al. Results on analogous compounds with deuteropyridine are also reported. Chloride complex seems to have pyridine in the first co-ordination sphere while the acetate complex is of the type of double salt.