Hjalmar Johan Fredrik Procopé (8 August 1889 – 8 March 1954) was a Finnish politician and a diplomat from the Swedish People's Party.

After his career as minister he worked as CEO of Finnish Paper Mills’ Association (Suomen Paperitehtaiden Yhdistys) from 1931 to 1939.

According to Finnish National Archive researcher Kauko Rumpunen, Franklin Roosevelt warned Procopé about the Molotov–Ribbentrop Pact and its contents on 28 August 1939.

This report was not taken entirely seriously by the government of Finland, partly because Roosevelt never revealed the original source of the tip, a subordinate of Joachim von Ribbentrop.

Hjalmar Procopé was put into awaiting posting and he resigned from the service of the Foreign Ministry in November 1945.