House that Menno Simons is believed to have worked in
|• Mayor||Jörg Lembke|
|• Total||52.6 km2 (20.3 sq mi)|
|Elevation||9 m (30 ft)|
|• Density||470/km2 (1,200/sq mi)|
|Time zone||CET/CEST (UTC+1/+2)|
The area has been inhabited since Mesolithic times. The flint tools found here from that era (6000–4500 BC) are clearly defined and known as the Oldesloer Stufe. For a number of years in the 18th Century the Moravian Church had a congregation in Bad Oldesloe. It was called "Pilgerruh", i.e. "Pilgrims' Rest". It was given up because of difficulties with the Danish Church authorities. At that time, the Duchy of Holstein was ruled by the kings of Denmark within the Holy Roman Empire.
On April 24, 1945 the town was heavily bombed by Allied forces in the final days of the Second World War in Germany. Three hundred buildings were destroyed, and 706 people were killed as a result of the operation.
- Hermann Olshausen (1796–1839), theologian
- Otto Wilhelm Sonder (1812–1881), botanist and pharmacist
- Theodor Mommsen (1817–1903), classical scholar, historian, jurist, journalist, politician, archaeologist, writer, and classicist
- August Mommsen (1821–1913), historian
- Klaus Bargsten (1911–2000), captain and sole survivor of sunken U-521
- Henning Schwarz (1928–1993), CDU politician
- Isa Genzken (born 1948), sculptress and contemporary artist
- Rüdiger Schmidt-Grépály (born 1952), Cultural Manager at the Klassik Stiftung Weimar
- Axel Hager (born 1969), beach volleyball player; won bronze medal at the 2000 Sydney Olympics (grew up in Bad Oldesloe)
- Katharina Fegebank (born 1977), politician (The Greens)
- Rouwen Hennings (born 1987), football player
- Julia Görges (born 1988), tennis player
- Maximilian Ahlschwede (born 1990), football player
- Dan-Patrick Poggenberg (born 1992), football player
- Dren Feka (born 1997), professional footballer
- "Statistikamt Nord – Bevölkerung der Gemeinden in Schleswig-Holstein 4. Quartal 2018 (XLS-file)". Statistisches Amt für Hamburg und Schleswig-Holstein (in German).
- Kuhlmann-Schultz, Kerstin (10 September 2014). "24. April 1945 — Oldesloes schwarzer Tag" [24 April 1945 - Oldesloe's black day]. Lübecker Nachrichten (in German). Retrieved 3 May 2019.