Observations with the International Ultraviolet Explorer (IUE) during the impacts of the fragments of comet D/Shoemaker-Levy 9 with Jupiter show far-UV emissions from the impact sites within a ~10 min time scale. Positive detections of H2 Lyman and Werner band (1230--1620 ¿) and H-Ly&agr; emissions are made for impacts K and S, and marginally for P2. No thermal continuum is observed. The radiated far-UV output was >1021 ergs. The H2 spectrum is consistent with electron collisional excitation if significant CH4 absorption is included. Such emissions could result from plasma processes generated by the impacts. Non-thermal excitation by the high altitude entry and explosion shocks may also be relevant. Emissions by Al+ (1671 ¿) and C (1657 ¿) of cometary origin are tentatively identified. ¿ American Geophysical Union 1995