- Proper noun. An ancient Roman family name, notably that of Gaius Iulius Caesar.
- Proper noun. (figuratively) The government; society; earthly powers.
- Noun. A title of Roman emperors.
- Noun. A Caesar salad.
- Noun. (Canada) A cocktail made from clamato (clam-tomato juice), vodka, and often garnished with celery, a Bloody Caesar.