SG Flensburg-Handewitt is a professional handball club from Flensburg and Handewitt in Schleswig-Holstein, Germany. Currently, they compete in the Handball-Bundesliga and EHF European League. They play home matches at Flens-Arena. Since forming in 1990, the club has been one of Germany's most successful teams domestically and in European tournaments. The club is best known for winning the EHF Champions League in 2014 by defeating arch-rivals THW Kiel in the final 30–28.

Flensburg is an independent town in the far north of the German state of Schleswig-Holstein. After Kiel and Lübeck, it is the third-largest town in Schleswig-Holstein.