SJ or S.J. may refer to:
Postnominal
- A member of the Society of Jesus (the Jesuits)
Places
- Saint John, New Brunswick, a city located in New Brunswick, Canada
- San Jose, California, a city located in Northern California, United States
- South Jersey, the southern half of the state of New Jersey
- St. John's, Newfoundland and Labrador, the capital city in Newfoundland and Labrador, Canada
- Subang Jaya, a residential hub in Klang Valley, Malaysia
- Suure-Jaani, Estonia
- Svalbard and Jan Mayen (ISO 3166-1 country code: SJ), two northern territories of Norway
Government and law
- Solicitors Journal
- Summary judgment, a legal motion
Military
- Sitara-e-Jurat, Pakistan's third highest military award
Sports
- San Jose Sharks, a National Hockey League (NHL) team, based in San Jose, California
- Show Jumping, a sport on horseback
- Strafe-jumping, a trickjumping technique
Transportation
- Jeep Cherokee (SJ) 1974-1983
- Jeep SJ platform
- SJ, the Swedish State Railways 1887–2000
- SJ AB, the Swedish national railway passenger operator 2001—
- Sriwijaya Air (ICAO code: SJY), an Indonesia-based low-cost airline
- Freedom Air (ICAO code: FOM), an defunct Air New Zealand Group low-cost airline.
- Statens järnvägar (English: Swedish State Railways), the government agency from which SJ AB was formed
- SuperJet, a personal water craft produced by Yamaha Motors
- Suzuki SJ 410 or 413, part of the Suzuki Jimny series
- The tail code for aircraft from Seymour Johnson Air Force Base
Linguistics
- Sj-sound, a sound in northern Germanic languages with disputed articulation location
Literature
- S.J., initials used by Samuel Johnson
In arts and entertainment
- SJ (singer), American folk-pop singer
- Super Junior, a famous South Korean boyband
- Samurai Jack, an American animated television series
- Superjail!, an American animated television series