Structurae is an online database containing works of structural and civil engineering of all kinds such as bridges, high-rise buildings, towers, dams, etc. Additionally, the database contains information on companies and persons (engineers, architects, and builders) involved in the design or construction of the structures. The name Structurae is based on the Latin word strūctūra (in its nominative plural or genitive singular form), which signifies the act of construction as well the result of that action.

Structurae is supported by contributions from hundreds of volunteers who share their data, information and images to the various entries. Most entries contain references from specialized journals and other sources. The founder, Nicolas Janberg, is a Franco-German bridge engineer who decided to create Structurae in 1998 after creating a similar course home page while a teaching assistant in the Department of Civil Engineering at Princeton University. Structurae was based in idea and structure on the architecture database archINFORM, which is considered a pioneering project in cataloging building data on the Internet.