Allentown may refer to several places in the United States and topics related to them:

• Allentown, California, now called Toadtown, California
• Allentown, Georgia, a city in four counties in Georgia
• Allentown, Illinois, an unincorporated community in Tazewell County
• Allentown, New Jersey, a borough in Monmouth County
• Allentown, Buffalo, a neighborhood in Buffalo, New York
• Allentown, a hamlet in the town of Alma, New York in Allegany County
• Allentown, a hamlet in the town of Hadley, New York in Saratoga County
• Allentown, Ohio, an unincorporated community
• Allentown, Allegheny County, Pennsylvania, a suburb of Pittsburgh, Pennsylvania
• Allentown, Pennsylvania, a city in eastern Pennsylvania
  • Allentown-Bethlehem-Easton metropolitan area, a metropolitan area also known as the Lehigh Valley
  • "Allentown" (song), by American singer Billy Joel (1982) about Allentown, Pennsylvania
  • "Allentown Jail", a folk-style song written by American Irving Gordon
  • Allentown Ambassadors (1997-2003), a defunct independent baseball team
  • Allentown Jets (1958-1981), a defunct minor league basketball team
• Allentown, Washington, a neighborhood in Tukwila, Washington