Tarquin may refer to:
- Tarquin (opera), a chamber opera
People with the given name Tarquin (Latin Tarquinius):
- Tarquin the Elder (died 579 BC), fifth of the seven legendary kings of Rome
- Tarquin the Proud (died 496 BC), last of the seven legendary kings of Rome
- Sextus Tarquinius, son of Tarquin the Proud
- Tarquin Hall (born 1969), British writer and journalist
- Tarquin Blackwood, a fictional character from The Vampire Chronicles
- General Tarquin, Lawful Evil character from the webcomic The Order of the Stick
People with the surname Tarquin:
- Brian Tarquin (21st century), American guitarist
- Didier Tarquin (born 1967), French cartoonist and scenarist