Barbara Ann Barnett Tillett (born 1946)[1] is a librarian and library scholar known for her work on authority control and bibliographic data modeling.

"[4] Tillett served as chief of the Library's Cataloging Policy & Support Office, which sometimes put her into conflict with Sanford Berman's subject heading activism.

[6] Tillett has been particularly well known for her development and explanation of the Functional Requirements for Bibliographic Records (FRBR) model.

[7] Tillett served as a consultant to the IFLA Study Group on the Functional Requirements for Bibliographic Records, which developed the model.

[8] She has also been highly involved in the development of RDA, a cataloging code based on the FRBR model.