The McLaren MP4/14 was used by the McLaren-Mercedes team in the 1999 Formula One World Championship. The chassis was designed by Adrian Newey, Steve Nichols, Neil Oatley and Henri Durand with Mario Illien designing the bespoke Ilmor engine. The car was used by Mika Häkkinen to win the Drivers' Championship for the second time in a row, although the Constructors' Championship was won by Ferrari using the F399.

The MP4/14 was the fastest car of the season, with aerodynamics that were even more advanced than the previous year's all-conquering MP4/13, while the Mercedes engine remained the most powerful on the grid. However, serious reliability problems as well as errors by the drivers meant that the Constructors' Championship was won by Ferrari.