Tonight (often referred to as The Tonight Programme and formerly known as Tonight with Trevor McDonald) is a British current affairs programme, produced by ITV Studios (formerly Granada Television) and ITN for the ITV network, replacing the long-running investigative series World in Action in 1999. Previously airing twice-weekly, on Monday and Friday evenings at 8.00pm (ITV Wales, STV and UTV would often air the programme at different times or different days, to make way for regional programming), the show runs the gamut from human interest-led current affairs to investigative journalism.

Tonight has conducted interviews with a plethora of political and public figures, including U.S. President George W. Bush, Prime Minister Tony Blair and former U.S First Lady Hillary Clinton.

From 1999 to 2007, the programme was known as Tonight with Trevor McDonald. The programme currently airs in the Thursday night timeslot, usually at 8.30pm on ITV1 and 10.45pm on STV, with Paul Brand as host from March 2022.