Farthing may refer to:
- Farthing (British coin), an old British coin valued one quarter of a penny
- Farthing (Irish coin), its counterpart among the pre-decimal Irish coins
- Farthing (magazine), a defunct British science fiction magazine
- Farthing (novel), a novel written by Jo Walton
- farthing, used in the King James Version of the Bible to translate κοδράντης (kodrantes, quadrans), a Roman coin
- Farthings of Iceland, historical administrative divisions of Iceland
- Farthing, Wyoming (also known as Iron Mountain), a railroad station and post office in Wyoming