| Birger Elmér | |
| Birth Name: | Carl Gustaf Birger Elmér |
| Birth Date: | August 8, 1919 |
| Birth Place: | Jönköping, Sweden |
| Death Place: | Jönköping, Sweden |
| Party: | Social Democratic[1] |
Carl Gustaf Birger Elmér (August 8, 1919 - November 8, 1999) was a Swedish military and intelligence officer. Until 1975 he was the head of the Swedish Armed Forces' secret intelligence agency, known as IB.