ESPN3 (formerly ESPN360 and ESPN3.com) is an online streaming service owned by ESPN Inc., a joint venture between the Walt Disney Company (which operates the network, through its 80% controlling ownership interest) and Hearst Communications (which holds the remaining 20% interest), that provides live streams and replays of global sports events to sports fans in the United States.

[7] As of 2023, ESPN3 broadcasts are mostly events that air over-the-air on ABC exclusively (with some exceptions when those broadcasts do not air on ESPN3 but instead on ESPN+), alternate camera angles of programming airing in simulcast on one of the linear networks (see ESPN Megacast), panorama coverage of multiple courts (in the case of bracket tournaments, especially for major tennis tournaments), Spanish dubs not carried on ESPN Deportes, and a limited amount of exclusive college sports programming, mostly from smaller colleges and universities.

In contrast to WatchESPN and other TV Everywhere services, access to ESPN3 from computers is automatically determined by assessing the incoming IP address.

In the United States, the network is available to individuals who receive their high-speed Internet connection or cable television subscription from an affiliated service provider.

ESPN3 is not carried by traditional cable and satellite providers, as it is not a single channel, but streams multiple live events at the same time; however, ESPN includes a listing for a linear "ESPN3" channel (which only includes one event at a time) in the television listings on its website.

There is no way for individual users to overcome these access restrictions as ESPN3 does not provide subscription options for individual users or any other non-ISP entities, and because most ISPs operate in specific territories without competition, a subscriber cannot access ESPN3 unless a participating ISP actually operates in the area.