Abstract : For several decades the special properties of ordered intermetallic alloys have intrigued alloy designers. In particular, the aluminides offered the potential for high temperature structural applications due to good strength combined with oxidation resistance. Attainment of this potential has been hampered by the brittle behavior and low fracture toughness of these materials. However, in recent years significant improvement in the ductility and toughness of, at first, titanium aluminides, then iron and nickel aluminides, has been achieved by metallurgical techniques such as processing control, grain refinement, and microalloying. These successes have stimulated new interest in ordered intermetallics - in particular the aluminides. The Materials Research Society symposium on High-Temperature Ordered Intermetallic Alloys provided a forum to discuss the alloy chemistry, physical metallurgy, and mechanical behavior of ordered intermetallic alloys which have potential to be used as new structural materials. The symposium contained presentations in the areas of theory of alloy ordering, microstructural features and phase transformation, mechanical behavior, alloy design, and physical properties.