The yellow jack is a species of offshore marine fish in the jack family.

Yellow Jack or Yellow Jack fever may also refer to:

• Yellow fever, an acute viral disease.
• Typhoid fever, a bacterial disease.
• Yellow Jack (play), a 1934 American play about the search for the causes and treatment of yellow fever.
• Yellow Jack, a 1938 film adaptation of the play.
• The Yellow Jack, a yellow flag used to identify ships quarantined due to the presence of a disease.

This disambiguation page lists articles associated with the title Yellow jack.
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