AB Svenska Järnvägsverkstädernas Aeroplanavdelning

AB Svenska Järnvägsverkstädernas Aeroplanavdelning (English: Swedish Railroad Workshops' Air Plane Department), commonly shortened to ASJA, was a Swedish aircraft manufacturing company.

Based in Linköping, Sweden, it was established during late 1930 as a subsidiary venture of the industrial conglomerate AB Svenska Järnvägsverkstäderna (English: Swedish Railway Workshops Co). production activity centred around licensed production of aircraft designed by other companies, but it also pursued its own designs, such as the ASJA L1 Viking and ASJA Viking II. In 1936, ASJA held discussions with Bofors towards creating a common company for design and manufacturing of aircraft; on 31 March 1937, the two companies formed the short-lived AB Förenade Flygverkstäder (AFF). During 1939, ASJA was acquired and integrated into a new entity, Svenska Aeroplan AB (more commonly known as Saab).