Yields per 100 eV of products of 60 Co gamma-radiolysis of anhydrous liquid formamide at room temperature, which are either gaseous under ordinary conditions or are less volatile than formamide, obtained with 10-Mrad dose, were <tex-math>$G({\rm H}_{2})=0.8_{7}$</tex-math>; <tex-math>$G({\rm CO})=0.6_{1}$</tex-math>; <tex-math>$G({\rm CO}_{2})=0.2;G({\rm NH}_{3})=0.7$</tex-math>; <tex-math>$G[({\rm CONH}_{2})_{2}]=0.2$</tex-math>; <tex-math>$G[({\rm HCONH})_{2}]=0.04$</tex-math>; <tex-math>$G({\rm C}_{4}{\rm H}_{8}{\rm N}_{2}{\rm O})=0.06$</tex-math>; polymer, mol. wt. 1655, G = 0.006; and G(HCN), trace. <tex-math>$G({\rm NH}_{3})$</tex-math> and G(HCN) decrease sharply with increasing dose amounting to 2.6 and 0.3 molecules/100 eV, respectively, with a dose of 0.16 Mrad. <tex-math>$G({\rm CO}_{2})$</tex-math> is similarly dose dependent, but <tex-math>$G({\rm H}_{2})$</tex-math> and G(CO) are not. N 2 O up to concentrations of the order of <tex-math>$4\times 10^{-2}$</tex-math> M has little or no effect on <tex-math>$G({\rm H}_{2})$</tex-math> and G(CO), although substantial amounts of N 2 are produced. Water at concentrations up to 0.1 M did not influence <tex-math>$G({\rm H}_{2})$</tex-math>, G(CO), or <tex-math>$G({\rm CO}_{2})$</tex-math> significantly. The isotopic composition of hydrogen produced by radiolysis of <tex-math>${\rm HCOND}_{2}$</tex-math> in the liquid and solid states indicates selective detachment from carbon. Selectivity is more pronounced in the solid state. The chemical significance of the data is discussed.