5th-century BC architects

Callicrates or Kallikrates (; ) was an ancient Greek architect active in the middle of the fifth century BC. He and Ictinus were architects of the Parthenon (Plutarch, Pericles, 13). An inscription identifies him as the architect of "the Temple of Nike" on the Acropolis of Athens (IG I3 35). The temple in question is either the amphiprostyle Temple of Athena Nike now visible on the site or a small-scale predecessor (naiskos) whose remains were found in the later temple's foundations.

Ictinus (; , Iktinos) was an architect active in the mid 5th century BC. Ancient sources identify Ictinus and Callicrates as co-architects of the Parthenon. He co-wrote a book on the project – which is now lost – in collaboration with Carpion.

5th-century BC Chinese engineer and inventor