Whistler is a resort municipality located in the Squamish-Lillooet Regional District of British Columbia, Canada. Situated in the southern Pacific Ranges of the Coast Mountains, it lies approximately 125 kilometers north of Vancouver and 36 kilometers south of Pemberton. The community occupies the Whistler Valley, positioned between the headwaters of the Green River and the upper reaches of the Cheakamus River, flanked by glaciated mountains including the Garibaldi Ranges.

Before European settlement, the area was used by the Lilʼwat and Squamish First Nations, who called it Cwítima and Sḵwiḵw respectively. Early British surveyors in the 1860s named the mountain London Mountain, but the region acquired the name Whistler due to hoary marmot calls. The area developed from logging and trapping camps into a resort community, becoming British Columbia's first resort municipality in 1975. It was granted heraldic symbols by the Canadian Heraldic Authority in January 2016.

The municipality features a pedestrian village that has won numerous design awards and serves as a hub for alpine activities. The area includes Whistler Blackcomb, formed by the 1997 merger of Whistler and Blackcomb mountains, which boasts the largest ski area in North America. Notable geographical features include Alta Lake, Green Lake, and the confluence of Rubble Creek and the Cheakamus River, where the historic Indigenous village of Spó7ez once stood before being destroyed by natural events.

Whistler attracts over two million visitors annually for alpine skiing, snowboarding, and summer mountain biking. It hosted most alpine, Nordic, luge, skeleton, and bobsled events during the 2010 Vancouver Winter Olympics. Cultural attractions include the Whistler Film Festival held in December and the Squamish Lil'wat Cultural Centre. The area is also recognized for its microclimates, ranging from coniferous mixed forests to alpine tundra, supporting unique flora like the Whistler hybrid spruce.

The permanent population was 13,982 as of 2021, with an additional estimated 3,241 seasonal residents. Access is primarily via the Sea To Sky Highway from Vancouver, a journey taking approximately two to two and a half hours. The climate features cold wet winters with significant snowfall and warm summers, with temperatures averaging around 0°C in winter and reaching the high 20s Celsius in summer. Precipitation is significantly higher from November through April.