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The advent of vehicles capable of broad-envelope hypersonic flight requires the development of advanced methods for the measurement of air data parameters for vehicle flight and propulsion control. The requirements for hypersonic air data measurement are reviewed, and techniques for the measurement of air data parameters for hypersonic vehicles are presented and assessed. Today's hypersonic vehicles, primarily the space shuttle, have had restricted flight envelopes and required minimal air data measurement performance. Advanced hypersonic vehicles are now being designed that will greatly expand the envelope of hypersonic travel. Accurate measurement or derivation of vehicle altitude, rates, Mach number, angle of attack, and sideslip are required to ensure that operation of a hypersonic vehicle over a broader envelope is possible.