IceCube is a one-cubic-kilometer observatory for the detection of high-energy neutrinos. It is under construction in the clear deep ice below the South Pole Station and is scheduled for completion in 2011. Building upon the technology of the AMANDA experiment, IceCube will search for neutrinos from the most energetic astrophysical sources. It also will join the race to discover supersymmetric particles and the topological defects created in grand unified phase transitions in the early universe. IceCube is part of a larger program on Particle Astrophysics in the Departments of Astronomy and Astrophysics and Physics.