Whistler can refer to the following:

• Windows XP, codename Whistler
• James McNeill Whistler, (1834-1903) was an American painter
• Whistler, British Columbia is the municipality of the 2010 Winter Olympics Alpine events
• Whistler-Blackcomb is the ski resort that will actually host the 2010 Winter Olympics Alpine events
• Whistler (radio) is a very low frequency radio phenomenon.
• Whistler (electronics) - a brand name of mobile electronic equipment