Editing Saab 37 Viggen (section)

== Variants ==
{{More citations needed|date=May 2016}}
;AJ 37: Primarily a single-seat ground-attack fighter aircraft (AJ: Attack-Jakt), with a secondary fighter role.<ref name="Jackson p57">Jackson 1993, p. 57.</ref> RM8A powerplant. PS 37A radar.<ref name="Jackson p63-6">Jackson 1993, pp. 63–66.</ref> First delivery in mid-1971,<ref name= "Andersson148">Andersson 1989, p. 148.</ref> 108 built, with serial numbers 37001-37108.<ref name="Jackson p82">Jackson 1993, p. 82.</ref> 48 airframes upgraded to AJS 37.<ref name="wapj22 p31">Hewson 1995, p. 31.</ref> Partially decommissioned in 1998.
;SK 37: Two-seat trainer aircraft (Sk: Skol) with no radar and reduced fuel.<ref name="Jackson p70-1">Jackson 1993, pp. 70–71.</ref> First flight on 2 July 1970.<ref name="Andersson155">Andersson 1989, p. 155.</ref> 17 built, with delivery from June 1972, serial numbers 37801-37817.<ref name= "Jackson p82" /> Decommissioned in 2003, 10 airframes converted to SK 37E.
;SF 37: Single-seat photographic reconnaissance aircraft (SF: Spaning Foto), with radar replaced by battery of cameras in nose, with provision for additional reconnaissance pods.<ref name="Jackson p59,70">Jackson 1993, pp. 59, 70.</ref> It made its first flight on 21 May 1973.<ref name= "Andersson152">Andersson 1989, p. 152.</ref> 28 built, with deliveries from April 1977, serial numbers 37950-37977.<ref name="Jackson p82" /> 25 airframes upgraded to AJSF 37.<ref name="wapj22 p31" /> Partially decommissioned in 1998.
;SH 37: (SH- Spaning Hav, reconnaissance sea) Single-seat maritime reconnaissance and strike aircraft,<ref name="Andersson152" /> equipped with PS-371A radar.<ref name="Jackson p70">Jackson 1993, p. 70.</ref> 27 built, with delivery from June 1975, serial numbers 37901-37927.<ref name= "Jackson p82" /> 25 airframes upgraded to AJSH 37.<ref name="wapj22 p31" /> Partially decommissioned in 1998.
;Saab 37E Eurofighter: Proposed NATO replacement of F-104 Starfighter in 1975, none built.<ref name="Jackson p78">Jackson 1993, p. 78.</ref>
;Saab 37X: Proposed export version offered to Norway in 1967–68, none built.<ref name="Jackson p78,0">Jackson 1993, pp. 78, 80.</ref>
;JA 37: Primarily a single-seat all-weather interceptor fighter, with a secondary attack role. Its first flight was on 27 September 1974<ref name= "Andersson162">Andersson 1989, p. 162.</ref> with the first deliveries starting in 1979,<ref name="Andersson162" /> serial numbers 37301-37449. A {{Convert |10|cm|0|abbr=on}} stretch in the shape of a wedge wider at the bottom than on the top of AJ 37 fuselage between canard and main wing. PS 46A LD/SD radar. Partially decommissioned in 1998, some upgraded to JA 37D.
;AJS/AJSF/AJSH 37: Upgrade of some AJ/SF/SH 37 between 1993 and 1998. Avionics and software upgrade. 48 AJ 37 airframes modified. 25 SH 37 airframes modified. 25 SF 37 airframes modified. Decommissioned in 2005.
;JA 37C: Upgrade of older JA 37, avionics and software upgrade as well as the integration of countermeasures.
;JA 37D: Upgrade of older JA 37 between 1993 and 1998, avionics and software upgrade. Rb99 air-to-air missile (AIM-120 in Swedish service) integrated. 35 airframes modified.
;JA 37DI: JA 37D with avionics and software modified for international duties. Instruments labeled in English and feet/knots instead of meter/kmh. 20 airframes modified.
;SK 37E: Electronic warfare trainer, conversion of 10 obsolete SK 37 trainers from 1998 to 2000, serial numbers 37807-37811 & 37813-37817, decommissioned in 2007.
;37AU: Proposed Australian export variant with AIM-54 Phoenix missiles.<ref>Air Enthusiast, January 1973</ref><ref>Air Enthusiast, Vol.9/No.3, September 1975</ref><ref>{{cite book | url=https://libris.kb.se/bib/20912411 | title=Aircraft Saab 37AU : Specification. / D. 1 | date=1972 | publisher=Saab-Scania, Aerospace }}</ref><ref>{{cite book | url=https://libris.kb.se/bib/20912374 | title=Aircraft Saab 37AU : Specification. / D. 2 | date=1972 | publisher=Saab-Scania, Aerospace }}</ref> Cancelled in favour of F/A-18 Hornet.<ref>Modern Combat Aircraft 21, Robert F. Dorr, Ian Allan Ltd., 1985</ref>