Konstanze Klosterhalfen (born 18 February 1997) is a German athlete who competes in middle-distance running and the 5000 metres.
She is the 2019 IAAF World Championship bronze medalist in the 5000m event.
In 2017, Klosterhalfen became the youngest female runner to cover the 800m in less than 2 minutes, the 1500m in less than 4 minutes, and the 5000m in less than 15 minutes.
She is the current German national record holder for 1500 metres (indoor), one mile (in- and outdoor), 3000 metres (in- and outdoor) and 5000 metres.