Sami Yaffa (born Sami Lauri Takamäki September 4, 1963 in Espoo, Finland) is a bass guitarist best known for his work in New York Dolls, Michael Monroe's bands and Hanoi Rocks. He is currently the bassist for the Michael Monroe band and Compulsions. He also plays guitar in his own band Mad Juana.
Yaffa first began playing music in 1977, when he was fourteen years old, with a band called Babblers. He went along with another member of the Babblers (Pepe Seivo) and formed a punk rock band, Suopo, in 1979. They did not record any material and stayed relatively unknown even in the Finnish punk rock scene. Around this time Yaffa also played with another Finnish punk rock band, Pohjanoteeraus.
In 1980 Yaffa joined future Hanoi Rocks bandmate Andy McCoy in a legendary Finnish punk / rock band Pelle Miljoona Oy. The two of them took part in the band's most successful album "Moottoritie On Kuuma". Before the group toured they both decided to leave and to join Hanoi Rocks.