Knut Hjalmar Stolpe (23 April 1841 – 27 January 1905), was a Swedish entomologist, archaeologist, and ethnographer.

He was the son of Carl Johan Stolpe, the mayor of Norrköping, and Katarina Vilhelmina Charlotta Eckhoff.

He graduated from Uppsala University in 1860 with a degree in zoology and botany and obtained a PhD in 1872.

Over a period of twenty years, he carried out large excavations at Birka on Björkö where there are burial mounds dating from the Bronze Age.

During land excursions, Stolpe collected 7500 cultural specimens for an intended ethnographical museum in Sweden.