Nuclear energy usually means the part of the energy of an atomic nucleus, which can be released by fusion or fission or radioactive decay. Nuclear energy also may refer to:
Nuclear binding energy, the energy required to split a nucleus of an atom.
Nuclear Energy (sculpture), a bronze sculpture by Henry Moore in the University of Chicago.
Nuclear potential energy, the potential energy of the particles inside an atomic nucleus.
Nuclear power, the use of sustained nuclear fission to generate heat and do useful work