Tammany or Tamanend was a Native American leader.
Tammany or Tamanend may also refer to:
- Mount Tammany, a mountain on the New Jersey/Pennsylvania border
- Tammany Hall, political organization in New York
- Tammany (Williamsport, Maryland), a house on the National Register of Historic Places
- Tammany (horse), a racehorse owned by Marcus Daly
- Tammany Young (1886–1936), American actor
- Tamanend, Pennsylvania, an unincorporated community
- Tamanend Middle School, Warrington, Pennsylvania