Near the Hirafu gondola (and where direct buses to/from New Chitose Airport originate and terminate), with English-language information. Open only during the snow season.
Lots of English brochures and maps (for Niseko and beyond), 200m down the street outside JR Kutchan Station. There's a smaller information centre (open 9am to 6pm) in the train station.
English hiking maps and information on the latest weather and trail conditions. Just above Goshiki Onsen, at the start of the hiking trail.
At JR Niseko Station, with pamphlets, maps, bus timetables; can help with bookings. It also has a centre at the View Plaza Michi-no-Eki on Rte 66 heading into town.