Nostrum may refer to:
- Nostrum remedium is an ancient Latin term for trademarked patent medicine
- Air Nostrum is a regional airline based in Valencia, Spain.
- Exultavit cor nostrum is a papal bull from Urban IV to the Mongol Ilkhanate leader Hulagu in 1263-1264.
- Mare Nostrum was a Roman name for the Mediterranean Sea.
- Pascha Nostrum is a hymn used by Christians during Easter season.