| Hermanni Pihlajamäki | |
| Birth Date: | 11 November 1903 |
| Birth Place: | Nurmo, Finland |
| Death Place: | Ähtäri, Finland |
| Sport: | Wrestling |
| Club: | Vaasan Voima-Veikot |
| Show-Medals: | yes |
Herman Matinpoika "Hermanni" Pihlajamäki (11 November 1903 – 4 June 1982) was a Finnish wrestler. He competed in freestyle wrestling at the 1932 and 1936 Olympics and won a gold and a bronze medal, respectively. At the European championships he won a freestyle gold medal in 1931, and two silver medals in 1935, in freestyle and Greco-Roman wrestling.
Pihlajamäki won six Finnish titles: in 1927, 1930, 1932 and 1935–1937, five of them in freestyle wrestling. He worked as a policeman. His cousin Kustaa was also a policeman and an Olympic champion in wrestling.