Abstract: A universal warhead adapter comprises a tubular sleeve configured to contain any of various warheads of different configurations, and an aft bulkhead designed to replicate the aft end of a standard warhead with which existing tail assemblies are compatible. A universal missile is made by disposing a selected warhead within the sleeve and fixing the warhead therein with fastening mechanisms, and attaching a tail assembly to the aft bulkhead and a nose assembly to the forward end of the sleeve. Control surfaces, rocket motors, and/or turbine engines can be attached directly to the sleeve. An umbilical can be routed internally from a tail assembly through the sleeve and can be connected to an aircraft electrical system via an integral connector attached to the sleeve.