Encyclopaedia Romana: Hypatia: Biography and related background information.
Hypatia: Resource page maintained by Peter Alfeld. Discusses probable birth and death dates, provides annotated links.
Hypatia: Biographical information, with an emphasis on what is known of Hypatia's philosophy.
Hypatia: Concise biography by Ginny Adair, with footnotes and links.
Hypatia of Alexandria: Resource page maintained by Howard A. Landman. Hosts a number of biographical works on Hypatia, as well as extensive annotated links.
Hypatia of Alexandria - Skeptical Christian: A collection of historical references, images, and quotes.