Oscar can refer to
- A colloquial term for Academy Award.
- A common name for a species of aquarium fish.
- The letter O in the NATO phonetic alphabet
- Oscar the Grouch is the name of a muppet on Sesame Street.
- Oscar I - king of Sweden and Norway
- Oscar II - king of Sweden and Norway
- Oscar Bernadotte - count of Wisborg, former prince of Sweden and Norway
- King Oscar sardines - a sardine brand
- Oscar is a comedy starring Sylvester Stallone as a reformed mafia don.