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|Designer(s)|| Sam Michael (Technical Director)
Loïc Bigois (Chief Aerodynamicist)
|Chassis||Carbon-fibre and honeycomb composite structure|
|Suspension (front)||Torsion bar|
|Suspension (rear)||Torsion bar|
|Engine||BMW P84/5 2.998L 90° V10 NA Mid-mounted|
|Transmission||Williams 7 speed transverse semi-automatic|
|Notable entrants||BMW WilliamsF1 Team|
|Notable drivers||7. Mark Webber
8. Nick Heidfeld
8. Antônio Pizzonia
|Debut||2005 Australian Grand Prix|
The Williams FW27 (unofficially known as BMW Williams FW27 and BMW FW27) was the Formula One car which the Williams team used during the 2005 Formula One season. While Williams was able to compete and take a couple of victories home in recent years, the FW27 proved not to be up to the same performance levels as some of the other teams' cars. New drivers Mark Webber and Nick Heidfeld scored points quite frequently, but a Grand Prix win was not within their reach. The highlight was the second and third places in Monaco. Heidfeld also scored a second place at the European race, where he started from pole. From the Italian Grand Prix onwards, Heidfeld, who was injured, was replaced by Antônio Pizzonia, who had previously been Webber's team-mate at Jaguar in 2003. The team ended the season in fifth place in the constructors' championship, failing to meet their own high expectations.
This car was the last Williams model that was powered by a BMW engine before BMW moved to BMW Sauber and also Michelin tires before they are switch to Bridgestone tires. The following year's model, the Williams FW28 had an engine provided by Cosworth.
BMW Williams went into 2005 season with renewed major sponsorships such as Allianz, FedEx, HP, Reuters, ORIS, Hamleys, Budweiser, Petrobras and Castrol. BMW Williams received new sponsorship such as RBS and discontinued sponsorships are NiQuitin Co., CCTV and Shanghai Circuit. The livery was similar to 2004 design with subtle changes.
Webber at the 2005 Canadian Grand Prix
Heidfeld at the 2005 Canadian Grand Prix
Heidfeld during the 2005 United States Grand Prix practice session
Webber at the 2005 United States Grand Prix
Complete Formula One results 
(key) (results in bold indicate pole position.)
|2005||BMW WilliamsF1 Team||BMW P84/5 V10||M||AUS||MAL||BHR||SMR||ESP||MON||EUR||CAN||USA||FRA||GBR||GER||HUN||TUR||ITA||BEL||BRA||JPN||CHN||66||5th|
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