The Arrows A18 was the car with which the Arrows Formula One team competed in the 1997 Formula One World Championship. It was driven by Briton Damon Hill, the reigning World Champion who had made the surprising move to the team after being dropped by Williams, and Brazilian Pedro Diniz, who had moved from Ligier. 1997 marked a new beginning for the team, with two new drivers, a new engine supplier in Yamaha and new tires by Bridgestone, supplied under an exclusive deal.

After a disastrous start to the season which saw the cars almost fail to make the grid in Australia, the team improved, hiring John Barnard as Technical Director. The A18 was proven to be woefully unreliable, despite Walkinshaw's claims that he had wanted a simple and basic chassis design. Damon Hill stated in his autobiography that the car was good to drive but lacked downforce. Hill scored a point at Silverstone, but the highlight of the year came at the Hungarian GP, where he qualified third and led for most of the race. The failure of a throttle linkage component saw him drop behind Jacques Villeneuve on the final lap, although second place was still a great success for the team. Diniz also scored two points at the Nürburgring. The team eventually finished eighth in the Constructors' Championship, with nine points.