Alli is a proper noun that can refer to:
Alli is a surname especially worn by:
- Mousa Alli, or Moussa Ali or Moussa 'Ali or Musa Ali or Mussa-Ali, a volcano on the borders between Eritrea, Ethiopia and Djibouti;
- Sorc-Alli or Mallahle, or Mallali or Sorc-Ali, an Ethiopian volcano located not far from the border with Eritrea.
- allí is a Spanish word, adverb of place, which means "there";
- Alli, trade name for Orlistat, a medicine marketed by GlaxoSmithKline, Roche's equivalent being Xenical;