| Acronym | Definition |
|---|
| SJ | Super Junior |
| SJ | St. Joseph (various organizations) |
| SJ | Social Justice (various organizations) |
| SJ | Society of Jesus (formal name for Jesuits, Roman Catholic Order of men) |
| SJ | San Jose |
| SJ | South Jersey (New Jersey) |
| SJ | San Juan (Argentina province) |
| SJ | Show Jumping |
| SJ | Svalbard (Internet country code) |
| SJ | Saint John (New Brunswick, Canada) |
| SJ | Svalbard and Jan Mayen Islands (ISO country code) |
| SJ | Shonen Jump (Manga) |
| SJ | Summary Judgment (civil procedure legal practice) |
| SJ | Shonen Jump (Dragonball) |
| SJ | Super Jump |
| SJ | Skinny Jeans (fad diet) |
| SJ | St. Jude's (Children's Hospital) |
| SJ | Samurai Jack (cartoon) |
| SJ | Short Jacket (bullet type) |
| SJ | Small Job |
| SJ | Side Judge (football) |
| SJ | Statens Järnvägars (railroad company in Sweden) |
| SJ | Stupid Jerk |
| SJ | Semaine Judiciaire (French: Legal Week; Swiss publication) |
| SJ | Strafe Jump (gaming) |
| SJ | Selective Jettison |
| SJ | Surface Search Radar for Submarines (US Navy) |
| SJ | Semi Jacketed (bullet type) |
| SJ | Scintilla Juris (fraternity) |
| SJ | Shivan Juggernaut (Freespace 2) |
| SJ | Svedkove Jehovovi (Czech: Jehovah's Witnesses) |
| SJ | Smart Jewelers |
| SJ | Support Jamming |
| SJ | Shop Joint (design engeeniering) |
| SJ | Sack Jacket |
| SJ | Shrinkage Joint |
| SJ | Spiffy Juice (website) |
| SJ | Stuffing Jitter |
| SJ | Sitara-E-Jura'at (The Star of Gallantry awarded to Pakistan Armed Forces) |
| SJ | Swanley Junction (railway station; UK) |
| SJ | Sievers' J-Value (engineering/geology) |