Look up fifth wheel in Wiktionary, the free dictionary.

A fifth wheel is a coupling that provides a link between the trailer and a truck (or a tractor unit).

Fifth wheel may also refer to:

• Fifth-wheel trailer, a type of travel trailer that is a variant of the tractor-trailer version
• Fifth wheel (Brooks Walker), an invention designed to aid parking cars
• Fifth Wheel Truck Stops, a truck stop chain across Southern Ontario, Canada
• The 5th Wheel, an American reality dating show
• The Fifth Wheel (film), a 2013 comedy-drama film
• "Fifth Wheel", a song by Avail from their 1998 album Over the James
• An idiom meaning "an extra and unnecessary person or thing"

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