Water resources data for the 1983 water year for Wyoming consists of records of stage, discharge and water quality of streams; stage and contents of lakes and reservoirs; and water levels and water quality of ground water. This report contains discharge records for 193 gaging stations; stage and contents for 14 lakes and reservoirs; water quality for 83 gaging stations, and 63 ungaged stations; and water levels for 35 observation wells. Also included are 32 crest-stage partial-record stations. Additional water data were collected at various sites, not part of the systematic data collection program, and are published as miscellaneous measurements. These data represent that part of the National Water Data System operated by the U.S. Geological Survey and cooperating State and Federal agencies in Wyoming.