Williams Racing, legally known as Williams Grand Prix Engineering Limited and competing as Atlassian Williams Racing, is a British Formula One team and constructor. It was founded by Frank Williams (1942–2021) and Patrick Head. The team was formed in 1977 after Frank Williams's earlier unsuccessful F1 operation, Frank Williams Racing Cars (which later became Wolf–Williams Racing in 1976). The team is based in Grove, Oxfordshire, on a 60-acre (24 ha) site.

The team's first race was the 1977 Spanish Grand Prix, where the new team ran a March chassis for Patrick Nève. Williams started manufacturing its own cars the following year, and Clay Regazzoni won Williams's first race at the 1979 British Grand Prix. At the 1997 British Grand Prix, Jacques Villeneuve scored the team's 100th race victory, making Williams one of only five teams in Formula One, alongside Ferrari, McLaren, Mercedes, and Red Bull Racing to win 100 races. Williams won nine Constructors' Championships between 1980 and 1997. This was a record until Ferrari won its tenth championship in 2000.