|Body style(s)||3-door hatchback|
|Engine(s)||1.0L & 1.3L petrol, 1.4L diesel|
|Transmission(s)||5-speed manual or CVT|
|Wheelbase||2000 mm (78.7 in)|
|Length||2985 mm (117.5 in)|
|Width||1680 mm (66.1 in)|
|Height||1500 mm (59.1 in)|
|Curb weight||860 kg (1,896 lb)|
|Fuel capacity||32 L (8 US gal; 7 imp gal)|
Toyota first introduced the iQ as a concept city car at the 2007 Frankfurt Auto Show. Toyota later revealed the production version at the 2008 Geneva Auto Show. with Japanese sales beginning in October 2008 and UK sales in January 2009.
Initially designed at Toyota Europe Design Development (Toyota ED2),  Toyota's design studio in Nice, France, Toyota claims the IQ is the world's smallest four-seat car — though by all accounts one of those four passengers must in fact be a small child.
The design emphasizes low fuel consumption, maneuverability, environmental friendliness, and maximized interior space. Six specific design factors contribute to IQ's minimal overhangs, forward windscreen location, maximized cabin space and overall compactness. These include a flat under-floor fuel tank, a newly developed differential, radically angled rear suspension dampers, a centre take-off steering gear (positioned higher in the engine bay), an asymmetrical dashboard and a significantly miniaturized heater/air conditioning unit.
The iQ includes nine airbags, including a rear window air bag to protect backseat passengers from rear end collisons. A panoramic glass sunroof featured on the concept version of the IQ, has not been included on the production model. The iQ has been designed to meet Euro NCAP’s top five-star safety rating.
In Europe, Toyota will offer the iQ with two petrol engines and one diesel. CO2 emissions for the 1L 5spd are 99g/km, making it Road tax free in the UK. It has a 3.9 m (13 ft) turning radius. It has a similar engine to Aygo, a 997cc rather than 998 cc 3 cylinder due to a slightly shorter stroke, 67 bhp (50 kW; 68 PS), 67 lb·ft (91 N·m) at 4800 rpm. 0-100 km/h 14.1 seconds. The iQ achieves 65.69 Imperial mpg (4.30 l/100km) by European standards.
Reports suggest the iQ may be the first model in a series, and that Toyota may export the iQ to the North American market as a Scion.  Reports from Toyota engineers suggest the iQ platform will serve as the basis of the next generation Toyota Yaris as well as a possible subcompact hybrid car, to challenge the CY 2009 Honda Insight Competitors include the Fiat 500, Subaru R1 and Smart ForTwo.
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- "Outsmarting the Smart". Edmunds Inside Line, Peter Lyon, 08-27-2008. http://www.edmunds.com/insideline/do/Drives/FirstDrives/articleId=131327.
- 2007 Frankfurt Auto Show: Toyota iQ
- World's smallest four-seater car takes centre stage | the Daily Mail
- "Toyota develops rear window air bag". http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20080930/Toyota_airbag_080930/20080930?s_name=Autos&no_ads=. Retrieved on 2008-09-30.
- Toyota Launches iQ Concept
- CAR review 2Sep08
- iQ on sale in Europe
- Malloy, Gerry (2008-02-23). "Production version set for Toyota mini-car concept". Toronto Star. http://www.wheels.ca/article/191765. Retrieved on 23 February 2008.
- Toyota iQ For U.S. - As a Scion!
- 2009 Toyota iQ: First of a New Small-Car Family
- Official Toyota iQ Blog (Template:Language/en)
- Official Toyota iQ site - UK (Template:Language/en)
- Toyota IQ press release
- Russian Toyota iQ Club