Various alternatives have been proposed for the disposal of high-level and transuranic radioactive waste generated from the nuclear electric power industry and the U.S. Defense program. The most advanced disposal option, and the one under active development, is the U.S. owned and operated deep-mined geologic repository. This report reviews the primary alternative concepts to the geologic repository, their present state-of-development and, to the extent possible, their environmental implications. The concepts included are: transmutation, extraterrestrial disposal, seabed disposal, ice sheet disposal, and other continental geologic disposal. Projections of radioactive waste quantities and technologies for partitioning and fractionation of the waste are also discussed.