Johan Augustin Mannerheim
| Johan Augustin Mannerheim | |
|---|---|
| A portrait of Mannerheim by Johan Henrik Scheffel | |
| Born | 8 August 1706 Sweden | 
| Died | 26 August 1778 (aged 72) Tärnö, Nyköping, Sweden | 
| Nationality | Swedish | 
| Title | Baron | 
| Spouse(s) | Margareta Elisabet Nordenflycht Helene Maria Söderhjelm | 
| Children | Baron Lars Augustin Mannerheim Count Carl Erik Mannerheim | 
| Parent(s) | Augustin Mannerheim Anna Elisabet Olderman | 
| Relatives | Baron Carl Gustaf Emil Mannerheim | 
| Family | Mannerheim | 
Baron Johan Augustin Mannerheim (8 August 1706 – 26 August 1778) was a Swedish nobleman, the Artillery Colonel and the Gothenburg Commandant. He was a great-great-grandfather of Baron C. G. E. Mannerheim, the Marshal of Finland.