Theobald Johannes Krüper (30 June 1829 – 23 March 1921[1]) was a German ornithologist and entomologist who worked mainly as a curator at the University of Athens museum.
As a child he began collecting butterflies and birds eggs and peaked at high school after meeting Carl August Dohrn.
The lepidopterist Erich Martin Hering also inspired him and Martin Carl Heinrich von Lichtenstein, privy councillor in Berlin entrusted Krüper with the egg collections at the museum offering him a position to deal with the mollusc collections.
Otto Staudinger who was also studying in Berlin became a close and lifelong friend of Krüper.
He then collected extensively in the Mediterranean region covering Macedonia, Smyrna, Constantinople and the Kyllene Mountains.