Johannes-Andreas Hanni (24 March 1957 – 6 November 1982) was an Estonian serial killer who murdered three people in 1982 with the aid of his wife Pille.

[2] Hanni stabbed his first victim to death, Eimar Vibo, a sailor from Saaremaa, on 5 March 1982 in Valdeku Street in Nõmme and cut off part of his thigh and brought the piece home with him.

On 23 May 1982, in Jõhvi, Hanni stabbed to death a 75-year-old Belarusian pensioner named Ivan Sivitsky in his garden cottage sauna and cut off his genitals, wishing to use it as some kind of a dildo.

[3] In late July of the same year, he raped and killed a middle-aged female Russian vagrant named Yevgenia Koltsova who was picking raspberries in the forest between Laagri and Saue.

His wife, Pille Hanni, was convicted on charges of accessory to murder and spent nearly twelve years in Harku Prison before being released.