Ain-Ervin Mere (from birth to Estification Ain-Ervin Martson, also known as Ain Mere), February 22, 1903 - April 5, 1969, Leicester, England) was a leading Estonian collaborator with Nazi Germany. An Obersturmbannführer in the SS, he was also the head of the Sicherheitspolizei in Estonia (Estonian Security Police) following its creation in 1942.

According to the KGB archives, he was also an agent of NKVD, recruited on October 10. 1940. He was known under code name "Müller"

On February 5 1945 in Berlin, he founded the Eesti Vabadusliit together with SS-Obersturmbannführer Harald Riipalu.

He was sentenced to the capital punishment during the Holocaust trials in Soviet Estonia but was not extradited by Great Britain and died there in peace.