Major-General George R. Pearkes Building

Major-General George R. Pearkes Building
The Major-General George R. Pearkes Building, looking north from the neighbourhood of Sandy Hill.
General information
TypeHead office
Architectural styleModern, Brutalist
Address101 Colonel By Drive
Town or cityOttawa, Ontario
CountryCanada
Construction started1969
Completed1974
Design and construction
Architect(s)Smith Carter Parkin

The Major-General George R. Pearkes Building (often abbreviated as just Pearkes, French: Édifice Major-Général G. R. Pearkes) is an office building located downtown Ottawa, Ontario, Canada. It is the principal location of Canada's National Defence Headquarters (NDHQ); while NDHQ comprises a collection of offices spread across the National Capital Region, the Pearkes Building is its primary base. Located at 101 Colonel By Drive, it is often referred to as '101 Col By'.

As of 2022, the building is occupied by senior defence and military staff, procurement and policy officials, intelligence specialists, legal affairs and staff involved in infrastructure.