The Aberdeen Pavilion (Pavillon Aberdeen in French) is an exhibition hall in Ottawa, Ontario, Canada. Overlooking the Rideau Canal, it is located in Lansdowne Park, Ottawa's historic fairgrounds. For many years, the building was known as the "Cattle Castle", due to its use for the Central Canada Exhibition's agricultural exhibits and shows, and some people still refer to it by this nickname today. It is the last surviving Canadian example of what was once a common form of Victorian exhibition hall, and is now a National Historic Site.