Most residential and general organizational telephone directories are not cataloged by the Library of Congress, even though the Library maintains a large collection of foreign and domestic directories. Telephone directories for Luxembourg are located in the closed stacks in the Adams Building for uncataloged directories or in the general collections for cataloged directories.

This index describes the Library of Congress' holdings of telephone directories from Luxembourg as of October 2009. This is the sole finding aid for these directories, as the Library does not catalog general telephone books.

The index is organized first by locality, then by year. The type of directory is indicated by the words "Res." (residential), "Org." (organizational, which lists businesses, institutions, and government offices), or "Both." The "Notes" field provides additional information, such as the languages used in various parts of the book.

Recent copies of these directories are held on Deck 46 in open stacks, adjacent to the Main Reading Room. The uncataloged directories for Luxembourg featured in this guide are located on Deck 5S of the closed stacks in the Adams Building, so readers must request the items in the Main Reading Room by completing a call slip, or asking a reference librarian in the European Reading Room.

Additional directories may be identified in the Library's online catalog. To locate these directories, search the Library of Congress Online Catalog using subject keywords such as "Luxembourg" and "directories," or the name of a city plus "directories." Besides telephone directories, this kind of search also yields business/address directories from Luxembourg.