Avogadro may refer to:
- Albert Avogadro (1149–1214), canon lawyer and Latin Patriarch of Jerusalem
- Amedeo Avogadro (1776–1856), chemist; responsible for Avogadro's law
- Avogadro constant
- Avogadro's law, an ideal gas law
- Avogadro (crater), lunar crater
- Avogadro (software), molecular editor