Fifth is the ordinal form of the number five.
Fifth, 5th, or The Fifth may also refer to:
- Fifth Amendment to the United States Constitution, as in the expression "pleading the Fifth"
- Fifth Avenue
- Fifth column, a political term
- Fifth disease, a contagious rash that spreads in school-aged children
- Fifth force, a proposed force of nature in addition to the four known fundamental forces
- Fifth of July (New York), historic celebration of an Emancipation Day in New York
- Fifth (Stargate), a robotic character in the television series Stargate SG-1
- Fifth (unit), a unit of volume formerly used for distilled beverages in the U.S.
- 1st Battalion, 5th Marines
- The fraction1⁄5, one of five equal parts of a whole
- The royal fifth (Spanish and Portuguese), an old royal tax of 20%
