Allentown may refer to several places in the United States:
- Allentown, Arizona, an abandoned town in Apache County
- Allentown, California, now called Toadtown, California
- Allentown, Georgia, town in Wilkinson County
- Allentown, New Jersey, borough in Monmouth County
- Allentown, New York (disambiguation)
- Allentown, hamlet in the town of Alma, New York in Allegany County
- Allentown, hamlet in the town of Hadley, New York in Saratoga County
- Allentown, Buffalo, New York, neighborhood in Buffalo
- Allentown, Pennsylvania, county seat of Lehigh County (largest city named Allentown and third-largest city in Pennsylvania)
- Allentown-Bethlehem-Easton metropolitan area, metropolitan area including and surrounding Allentown, Pennsylvania
- "Allentown" (song), by singer Billy Joel about Allentown, Pennsylvania
- "Allentown Jail", folk song written by Irving Gordon
- Allentown Ambassadors, defunct independent baseball team
- Allentown Jets, defunct minor league basketball team
- Allentown (Pittsburgh), neighborhood on the south side of Pittsburgh, Pennsylvania
- Allentown, Washington, neighborhood in Tukwila
- South Lake Union, a neighborhood in Seattle, often called Allentown because of redevelopment led by Paul Allen's Vulcan Inc.