SGフレンスブルク・ハンデヴィット

SG Flensburg-Handewitt was created in 1990 following a merger of the handball divisions of TSB Flensburg and Handewitter SV. The first season of the club (1990–1991) took place in the 2. Handball-Bundesliga, with SG finishing in fourth position under Zvonimir Serdarušić. In 1992, they were promoted to the top division as SG Flensburg-Handewitt for the first time, winning every league fixture. In their first season in the top-flight, SG finished sixteenth, though they were spared relegation due to the liquidation of TSV Milbertshofen. The following year, under the leadership of Anders Dahl-Nielsen, SG were fourth and from that point, equalled that placement or better in each season until the 2008/09 season.

SG Flensburg-Handewitt acquired their first major trophy with the 1996/1997 EHF Cup by defeating Danish side Virum-Sorgenfri HK 52–42 on aggregate in the final. Three consecutive DHB-Pokal titles (2003/04 vs TUSEM Essen, 2004/05 vs HSV Hamburg, and 2005/06 vs THW Kiel) followed, as did success in the league, with a championship victory in the 2003/04 season. Flensburg defeated HSG Nordhorn-Lingen at Flens-Arena in round 33 to secure their very first title with a game to spare. Slovenian club RK Celje did however, prevent a third trophy that year for SG by winning the 2003-04 EHF Champions League final against them. The 2004-05 and 2005-06 league campaigns both saw Flensburg finish second behind THW Kiel. In 2007, SG once again lost the Champions League final, this time they were defeated by "Landesderby" rivals THW Kiel.

In 2010, former player Ljubomir Vranjes became the new coach and it was under him that SG Flensburg-Handewitt won the EHF Champions League final at their third attempt, beating THW Kiel 30–28 at the Lanxess Arena in Cologne. During Vranjes' time as coach of SG, they also won the DHB-Pokal for a fourth time, beating SC Magdeburg on penalties. Maik Machulla took over from Vranjes as head coach in 2017, and consecutive league titles (their second and third successes) followed in the 2017/18 and 2018/2019 campaigns. The 2017/18 title was secured on the final day of the season with a 22–21 victory over Frisch Auf Göppingen. The following year, SG once again took the title on the final day, winning 27–24 away at Bergischer HC. Machulla was sacked in April 2023 after Flensburg lost three vital matches in just eight days. They were defeated 38–31 by Rhein-Neckar Löwen in the DHB-Pokal semi-finals, 35–27 at Flens-Arena by BM Granollers in the EHF European League quarter-finals, and then 29–19 by THW Kiel in the Nordderby in a crucial Handball-Bundesliga game. SG Flensburg-Handewitt holds a reputation as being a perennial "second-place" club – with three league titles the team has also finished runner-up fourteen times. In addition to this, they reached each of the seven DHB-Pokal finals between 2011 and 2017, losing six of them.

The club has won all the competitions it has participated in at least once except the IHF Super Globe, and it is the only club to have won four different European Cups (one EHF Champions League, two EHF Cup Winners' Cup, one EHF European League and one EHF European Cup in addition to several finals), as well as the three different German national competitions (three German championships, four DHB-Pokal and three DHB-Supercup).

Due to their proximity to Scandinavia, SG typically have top international players from Denmark, Sweden and Norway in their squad. Danish right winger Lasse Svan became the club's all-time leading appearance maker during the 2021/22 season, overtaking legendary left winger and fellow Dane Lars Christiansen. At the most recent World Men's Handball Championship, the victorious Danish squad featured six Flensburg players.