Breitenbeek
Confluence of the Breitenbeek (l) with the Sperrlutter
Location
Country	Germany
State	Lower Saxony
Location	between Sankt Andreasberg and Bad Lauterberg in the Harz Mountains
Physical characteristics
Source
• elevation	over 620 m
Mouth
• location	Sperrlutter
• coordinates	51°39′45″N 10°30′23″E / 51.662444°N 10.506444°E / 51.662444; 10.506444
• elevation	360 m
Length	over 6 km (3.7 mi)
Basin features
River system	Sperrlutter→ Oder→ Rhume→ Leine→ Aller→ Weser→ North Sea
Waterbodies	Reservoirs: Engelsburger Teiche

The Breitenbeek is a roughly 6.3 km (4 mi) river of Lower Saxony, in the Harz Mountains of central Germany. It is a tributary of the Sperrlutter.^[1] It rises at over 620 m in the vicinity of the Rehbergklinik in Oderberg [de] (a part of Sankt Andreasberg). It then flows initially southwards through the Engelsburger Teiche, before it joins the Sperrlutter at 360 m. The Breitenbeek is the largest tributary of the Sperrlutter.

• 
  The sulphur spring is the best known spring of the Breitenbeek
• 
  At the end of the source region are the two Engelsburg ponds

• List of rivers of Lower Saxony