Longrun or Long Run may refer to:
- Long-run, a concept in economics
- LongRun, a power management technology
- Place names
- Long Run, Louisville, Kentucky, United States
- Long Run Massacre, a massacre during the American Revolutionary War
- Longrun, Missouri, United States
- Entertainment
- The Long Run (album), the sixth studio album by Eagles
- The Long Run (song), a song written by Don Henley and Glenn Frey
- Other uses
- Long Run (horse), a National Hunt racehorse