Île Sans Fil (French:"wireless island") is a non-profit community wireless network that provides free public wireless Internet access to mobile users in public spaces throughout the island of Montreal, Quebec, Canada. The organization works with cafés, restaurants, bars, stores, community organizations, and individuals to provide free Internet access in public spaces. As of April 2010, the network had over 140,000 registered users (1,000+ users daily) and over 212 live hotspots. In 2016, the organization changed it operating name to Zone Access Public Montréal

Île Sans Fil's mission is to use technology to bring people together and foster a sense of community. In pursuit of that goal, Île Sans Fil experimented in using hotspots to promote interaction between users, display new media art, and provide geographically and community-relevant information. The group was volunteer-based until 2010.

In addition to the deployment of these hotspots, a group of developers inside Île Sans Fil lead the development of the captive portal suite WiFiDog. This open source software was originally conceived for Île Sans Fil's internal use, but gained international recognition. More than 30 community wireless networks outside Montreal used the WifiDog solution: New York, London, Berlin, Vancouver, Toronto, Quebec City, Sherbrooke, Paris, Brest and Marseille.