4Y or 4-Y may refer to:

• 4 years
• 4Y, IATA code for Eurowings Discover and Airbus Transport International (controlled duplicate)
• 4Y, a series of models of Toyota Y engine
• 4Y, the production code for the 1978 Doctor Who serial Underworld

See also

• Y4 (disambiguation)

Topics referred to by the same term

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