Laser light can be used to cut and cauterize tissue. At the present time CO2 lasers at 10.6 um, argon ion lasers in the blue green part of the spectrum, and Nd:YAG lasers at 1.06 um have operational characteristics which make their use in surgery potentially valuable. In this paper, the optics presently used to deliver the light from these lasers to surgical targets are described. Since there is little optical design information available for existing devices and since a great deal of improvement is possible, most of the discussion is concerned with proposals for achieving improved performance. In addition, a discussion is included of safety precautions for both patients and operating room personnel.