Collision is a five-part British television drama serial, which debuted on ITV in November 2009. In the same month, it was also on PBS as a series in two parts. It tells the story of a group of strangers whose lives intertwine following a devastating car crash. The crash opens a number of startling revelations as stories of everything from government cover-ups and smuggling, to embezzlement and murder start to unravel.

The original British broadcast of Collision was edited from the original 5 hours (shown in five parts) down to three and a half hours (210 minutes, shown in two parts). The American broadcast on PBS's Masterpiece Contemporary, the Australian broadcast on ABC1 and the Region 1 (America and Canada) DVD release all featured the shortened version. In Australia, Foxtel and Austar's W Channel aired Collision in its original format of five 45-minute episodes (excluding advertisements), Tuesday, 15 March 2011.