ABC World News Tonight (titled ABC World News Tonight with David Muir for its weeknight broadcasts since September 2014) is the flagship daily evening television news program of ABC News, the news division of the American Broadcasting Company (ABC) television network in the United States. It is currently the most watched network newscast in the United States, with an average of 2 million more than its nearest rival, NBC Nightly News. Since 2014, the program's weekday broadcasts have been anchored by David Muir. As of February 6–7, 2021, Whit Johnson and Linsey Davis anchor the Saturday and Sunday editions of the newscast respectively.

The program has been anchored at various times by a number of other presenters since its debut in 1948. It also has used various titles, including ABC Evening News from 1970 to 1978, World News Tonight from 1978 to 2006, World News from 2006 to 2009, and ABC World News from 2009 to 2014. Since 2014, the program has been called ABC World News Tonight. The weeknight edition of ABC World News Tonight airs live at 6:30 p.m. in the Eastern and 5:30 p.m. in the Central Time Zones. However ABC affiliates KGNS, KNOE-2, WEEK-2, and WNCF air ABC World News Tonight half-an-hour later on delay. WSB also airs it on a delay, the only ABC station in the Eastern Time Zone to do so.