SJ or S.J. may refer to:
Arts and entertainment SJ (rapper), British rapper and member of the UK drill group OFB SJ (singer), American folk-pop singer Shankar–Jaikishan, Indian composer duo Super Junior, a famous South Korean boyband Samurai Jack, an American animated television series Superjail!, an American animated television series
Government, law, and politics Solicitors Journal, a legal periodical published in the United Kingdom Summary judgment, a legal motion Social justice, a movement for equality Secretary for Justice, in case citations
Military Sitara-e-Jurat, Pakistan's third highest military award SJ radar, a type of S band (10-cm) radar set used on American submarines during the Second World War
Places Saint John, New Brunswick, a city in New Brunswick, Canada San Jose, California, a city in California, United States San Juan, Puerto Rico, the capital of and largest city in Puerto Rico 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
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 Suzuki SJ 410 or 413, part of the Suzuki Jimny series SJ AB, the Swedish national railway passenger operator 2001— Statens Järnvägar (Swedish State Railways), the government agency from which SJ AB was formed, 1887–2000 Sriwijaya Air (IATA code: SJ), an Indonesia-based low-cost airline Freedom Air (IATA code: SJ), a defunct Air New Zealand Group low-cost airline The tail code for aircraft from Seymour Johnson Air Force Base SuperJet, a personal water craft produced by Yamaha Motors
Other uses Sj-sound, a sound in northern Germanic languages with disputed articulation location Shijian, a series of satellites built and operated by China ScratchJr, a programming language for children ages 5–7 A member of the Society of Jesus (the Jesuits) S.J., initials used by Samuel Johnson