SJA

SJA may refer to:
 * St John Ambulance, several organisations
 * St. Joseph Academy (St. Augustine, Florida), USA
 * The Sarah Jane Adventures, UK TV series
 * Sports Journalists' Association, UK
 * St. Joan of Arc Catholic High School, Maple, Ontario, Canada
 * St. Joan of Arc Secondary School, Hong Kong
 * St. Johnsbury Academy, Vermont, US
 * Saint Jerome's Academy, Bagabag, Nueva Vizcaya, Philippines
 * Saint Joseph Academy (disambiguation)
 * Staff judge advocate, role in the US Army