This text includes papers from the 11th Symposium on Space Nuclear Power and Propulsion, covering topics including: space exploration; fuels and materials; space nuclear safety; radioisotope power systems; key nuclear technologies for space exploration; space mission and power needs; heat pipe technology; nuclear thermal propulsion - facilities and testing; dynamic energy conversion; surface nuclear power; manufacturing and processing; thermionic energy conversion; reactor and power system control; nuclear electric propulsion - technology, simulation and modelling; innovative nuclear concepts; and nuclear thermal propulsion. This text is intended to be of use to nuclear physicists and engineers involved with NASA projects and mission planning, as well as chemical and mechanical engineers and major industrial and national laboratory researchers whose work is space related.