The Aberdeen Pavilion 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. It is the last surviving Canadian example of what was once a common form of Victorian exhibition hall, and was designated a National Historic Site of Canada in 1983.

Lansdowne Park is a 40-acre (16 ha) urban park, historic sports, exhibition and entertainment facility in Ottawa, Ontario, Canada, owned by the City of Ottawa. It is located on Bank Street adjacent to the Rideau Canal in The Glebe neighbourhood of central Ottawa. Lansdowne Park contains the TD Place Stadium and Arena complex, the Aberdeen Pavilion, and the Horticulture Building.