A tonneau is an area of a car or truck open at the top, when first instituted the tonneau was a pair of high-sided barrel-shaped seats, usually detachable additions to a roadster.

Look up tonneau in Wiktionary, the free dictionary.

Tonneau may also refer to:

• Tonneau (wine barrel), oak barrels for winemaking
• Tonneau (unit), a former unit of mass in the US

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