Also stationed at CFB Petawawa are 427 Tactical Helicopter Squadron and 2 Field Ambulance. Although these two units work closely with 2 CMBG, they are not officially part of the brigade group.
| 31 Canadian Brigade Group | | London
|
| 1st Hussars | Reconnaissance | London, Ontario
|
| The Windsor Regiment (RCAC) | Armoured |
|
| 11th Field Artillery Regiment, RCA | | Guelph, Ontario
|
| 56th Field Artillery Regiment, RCA | | Brantford, Ontario
|
| 31 Combat Engineer Regiment (The Elgins) | | St. Thomas, Ontario
|
| The Royal Hamilton Light Infantry (Wentworth Regiment)
| Dismounted infantry |
|
| The Lincoln and Welland Regiment
| Dismounted infantry | St. Catharines and Niagara Falls, Ontario
|
| 4th Battalion, The Royal Canadian Regiment (London and Oxford Fusiliers)
| Dismounted infantry | London and Stratford, Ontario
|
| The Royal Highland Fusiliers of Canada
| Dismounted infantry | Cambridge and Kitchener, Ontario
|
| The Essex and Kent Scottish Regiment
| Dismounted infantry | Windsor and Chatham, Ontario
|
| The Argyll and Sutherland Highlanders of Canada (Princess Louise's)
| Dismounted infantry | Hamilton, Ontario
|
| 21 (Windsor) Service Battalion | |
|
| 22 (London) Service Battalion | |
|
| 23 (Hamilton) Service Battalion | |
|
| 32 Canadian Brigade Group | | Toronto
|
| The Governor General's Horse Guards | Reconnaissance | Toronto, Ontario
|
| The Queen's York Rangers (1st American Regiment) (RCAC) | Reconnaissance | Toronto
|
| 7th Toronto Regiment, RCA | Artillery |
|
| 2 Field Engineer Regiment | | Toronto
|
| The Queen's Own Rifles of Canada | Dismounted infantry | Toronto
|
| The Royal Regiment of Canada | Dismounted infantry | Toronto
|
| The Grey and Simcoe Foresters
| Dismounted infantry | Owen Sound and Barrie, Ontario
|
| The Lorne Scots (Peel, Dufferin and Halton Regiment)
| Dismounted infantry | Brampton, Oakville and Georgetown, Ontario
|
| 48th Highlanders of Canada | Dismounted infantry | Toronto
|
| The Toronto Scottish Regiment (Queen Elizabeth the Queen Mother's Own)
| Dismounted infantry |
|
| 25 (Toronto) Service Battalion | |
|
| 25 Military Police Platoon | |
|
| 2 Intelligence Company | | Toronto
|
| 33 Canadian Brigade Group | | Ottawa
|
| The Ontario Regiment (RCAC) | Reconnaissance | Oshawa, Ontario
|
| 30th Field Artillery Regiment, RCA | "Bytown Gunners" | Ottawa, Ontario
|
| 49th (Sault Ste Marie) Field Artillery Regiment, RCA | |
|
| 1st Air Defence Regiment (Lanark & Renfrew Scottish), RCA | | Pembroke, Ontario
|
| Governor General's Foot Guards | Dismounted infantry | Ottawa
|
| The Princess of Wales' Own Regiment | Dismounted infantry | Kingston, Ontario
|
| The Hastings and Prince Edward Regiment
| Dismounted infantry | Belleville, Peterborough and Cobourg, Ontario
|
| The Brockville Rifles | Dismounted infantry |
|
| Stormont, Dundas and Glengarry Highlanders
| Dismounted infantry | Cornwall, Ontario
|
| The Cameron Highlanders of Ottawa | Dismounted infantry |
|
| The Algonquin Regiment | Dismounted infantry | North Bay, Ontario
|
| 2nd Battalion, Irish Regiment of Canada
| Dismounted infantry | Sudbury, Ontario
|
| 26 (North Bay) Service Battalion | |
|
| 28 (Ottawa) Service Battalion | |
|
| 2 Intelligence Platoon | | Ottawa
|
