The supermini, available in three- and five-door format, has been the first choice for UK car drivers for the first nine months of the year.
Over 77,000 Ford Fiestas have been sold in the UK in 2011, nearly 20,000 more than its closest rival, the Vauxhall Corsa.
The only other car to come close to the Ford Fiesta in terms of sales is another Ford model, the Ford Focus, on 67,672 sales.
The Ford Fiesta is helped by the fact supermini cars account for over a third of the entire car market in the UK as buyers move towards smaller, cheaper to run cars.
The Ford Fiesta is regarded as the best small car in the UK because of its low starting price but high level of equipment, attractive styling and responsive handling.
Ford Fiesta prices, courtesy of a new, entry-level Studio specification model introduced last month, have now fallen below £9,495 in the UK.
Standard equipment on the Ford Fiesta includes a radio and CD player with MP3 compatibility, four speakers, body coloured spoilers, heated door mirrors and electronic stability control.
Engine options range from the entry-level 1.25-litre petrol 60PS engine (also available in 82PS), through 1.4- and 1.6-litre petrol options and a diesel range including 1.4- and 1.6-litre units in various power outputs.
The Ford Fiesta also comes with a fuel-saving Econetic diesel engine which returns CO2 emissions low enough to warrant free road tax in the UK and fuel economy of 76.3mpg.
The Ford Fiesta, the UK’s best-selling car, is on sale now from £9,495.