Sagittarius (Latin plural and genitive Sagittarii) may refer to:
- Astrology
- Sagittarius (astrology), a Zodiac sign corresponding to the constellation
- Astronomy
- Sagittarius (constellation), corresponding to the astrological sign
- See Category:Sagittarius constellation for objects visually within the constellation, e.g. stars named ~ Sagitarii
- Sagittarius Arm, arm of the Milky Way
- Sagittarius A, complex radio source at the centre of the Milky Way
- Sagittarius B2, giant molecular cloud near the centre of the Milky Way
- Sagittarius Star Cloud, in the constellation
- Sagittarius Dwarf Elliptical Galaxy, satellite galaxy of the Milky Way, 70,000 light-years away
- Sagittarius Dwarf Irregular Galaxy, 3.4 million light-years away
- Fictional characters
- Sagittarius (comics), member of Zodiac, an evil group in the Marvel Universe
- Sagittarius Aioros (射手座のアイオロス Sajitariasu no Aorosu) in the manga series Saint Seiya
- Sagittarius, (Japanese weekly manga 'Fairy Tail'), one of the twelve Zodiac Celestial Spirits.
- Fictional places
- Sagitara, one of the Twelve Colonies in the Battlestar Galactica (1978 TV series)
- Sagittaron, one of the Twelve Colonies in the Battlestar Galactica (re-imagining)
- Ships
- USS Sagittarius constellation 456.87 (AKN-2), World War II US Navy cargo ship
- SuperStar Sagittarius, cruise ship
- Zoology
- Secretary Bird (Sagittarius serpentarius), large, mostly terrestrial bird of prey
- Sibynophis sagittarius, species of snake found in South Asia
- Other
- Sagittarii, Ancient Roman archers
- Sagittarius (band), late-60s studio group devised by producer and songwriter Gary Usher
- Sagittario, a Beyblade (toy) top from the Metal Fusion Hyrid Wheel system of Beyblades.