Kelly's Directory (or more formally, the Kelly's, Post Office and Harrod & Co Directory) was a trade directory in England that listed all businesses and tradespeople in a particular city or town, as well as a general directory of postal addresses of local gentry, landowners, charities, and other facilities. In effect, it was a Victorian version of today's Yellow Pages. Many reference libraries still keep their copies of these directories, which are now an important source for historical research.