Diemaco
| Company type | Private (division of Héroux-Devtek Inc.) | 
|---|---|
| Industry | Defence | 
| Founded | 1974 | 
| Fate | Acquired | 
| Successor | Colt Canada Corporation May 24, 2005 | 
| Headquarters | , | 
| Products | Firearms, weapons | 
Diemaco was a Canadian defence company based in Kitchener, Ontario, that manufactured the C7 family of rifles under a licence from Colt. The company was formed in 1974, effectively replacing the arms supply from government owned Canadian Arsenal Limited.
In 2000 it was acquired by Héroux-Devtek Inc.
On May 20, 2005 it was acquired by Colt Defense for $18.2 million.