This paper reviews the rapidly emerging field of excimer laser lithography. Beginning with the first sub-micron exposures, developments in excimer laser projection printing on various commercial lithographic machines are reviewed. Recent results obtained with full-field scanning projection systems as well as step-and-repeat tools are summarized. Future directions in optical lithography are examined in view of these advances. Finally, a discussion of various key excimer laser parameters is presented from two points of view: availability, and requirements for various practical lithographic systems.