Yearlong current meter data from western Hudson Bay show that the annual ice cover modifies the currents. Currents observed at three depths are dominated by barotropic semidiurnal tidal currents which reach amplitudes of 28 cm s-1 . During the ice-covered season the tidal currents and tidal heights observed inshore decrease, and their arrival times are advanced. Monthly mean currents set predominantly to the south and east in accordance with the cyclonic circulation pattern of the bay. Mean current speeds are less than 4 cm s-1 and are made up of wind-driven and density-driven components. Their onshore-offshore components vary in phase with the ice buildup and ice breakup seasons of the annual ice cover. Storm-generated inertial currents are as strong as the tidal currents but rotate clockwise, opposite to the tidal current direction. They decrease with depth and are absent during the ice-covered season. Inertial currents below the pycnocline lead those in the surface mixed layer by more than 180¿, simulating an upward phase velocity. Passing weather systems also generate 5- to 6-day periodic currents which slightly decrease but are coherent with depth. They reach magnitudes of up to 25 cm s--1 and occur throughout the year, regardless of the ice condition. ¿American Geophysical Union 1987