SJA may refer to:
- St. Joseph Academy (St. Augustine, Florida), a private, Catholic School in St. Augustine, FL, USA
- St. John Ambulance, a common name used by a number of first-aid and ambulance organisations
- The Sarah Jane Adventures, a children's television series spin off from Doctor Who
- Sports Journalists' Association, an association of United Kingdom sports journalists
- St. Joan of Arc Catholic High School, a school located in Maple, Ontario, Canada
- St. Joan of Arc Secondary School, a secondary school in Hong Kong
- St. Johnsbury Academy, a private school in Saint Johnsbury, Vermont, United States
- Saint Jerome's Academy, a private, Catholic school in Bagabag, Nueva Vizcaya, Philippines
- Saint Joseph Academy (disambiguation)
- Staff Judge Advocate, a role in the United States Army