Abstract: The invention relates to a process for the extraction of uranium (VI) and/or plutonium (IV) present in an aqueous solution by means of N,N-dialkylamides.These N,N-dialkylamides are in accordance with formula: ##STR1## in which R.sup.1 is a straight or branched alkyl radical with 2 to 12 carbon atoms, R.sup.2 and R.sup.4, which can be the same or different, are straight or branched alkyl radicals with 2 to 6 carbon atoms, R.sup.3 and R.sup.5, which can be the same or different, are straight or branched alkyl radicals with 1 to 6 carbon atoms and a and b, which can be the same or different, are integers between 1 and 6.For example, it is possible to use N,N-di-(2-ethyl hexyl)-2,2-dimethyl butyramide, N,N-di-(2-ethyl hexyl)-hexanamide or N,N-di-(2-ethyl hexyl)-dodecanamide for simultaneously extracting uranium and plutonium, or for separating the uranium from the plutonium without reducing the latter.