“Cassini” may refer to:
- Cassini’s laws, laws about motion on the Moon.
- Cassini Division, a gap in the Rings of Saturn.
- Cassini-Huygens, a spacecraft that explored Saturn.
- Cassini (Martian crater), a crater on Mars.
- Cassini (lunar crater) A crater on the Moon.
- 24101 Cassini, an asteroid.
- Cassini Regio, the dark region on the moon Iapetus.
- Giovanni Domenico Cassini (1625–1712), Italian mathematician, astronomer, engineer, and astrologer.
- Jacques Cassini (1677-1756), an astronomer.
- César-François Cassini de Thury (1714-1784), an astronomer and cartographer.
- Jean-Dominique, comte de Cassini (1748-1845), an astronomer.