Castle Avenue in North Belfast takes its name from its proximity to Belfast Castle which was built in 1870.
"That on the application of the owners a new street situate off Innisfayle Road be named Castle Avenue, and that the name Donegall Park Avenue be applied to a continuation of that Street". (23rd June 1903).
“The City surveyor submitted an application from the estate Superintendent for the naming of a street as Castle Ave in lieu of proportion of Castle Gardens. On recommended that the naming be approved. The recommendation was adopted”. (14th October 1952).