The bells are ringing around 5pm each day until United Nations Day on 24th October.
Hundreds of churches are taking part in the protest, mourning lives lost in Syria.
More than 300 churches took part in a coordinated ring on Sunday in an outcry against the devastating impact of the bombings on the besieged 3000-year-old Syrian city.
The Evangelical Lutheran Parish of Kallio in Helsinki began the protest last week and says more churches join each day.
Dr Teemu Laajasalo, Vicar of Kallio Parish, said: "Schools and hospitals are being bombed in Aleppo.
"The very buildings meant to protect, nurture and sustain life are being demolished. Small children are being killed, the ones that need our care and protection the most.
"But the issue is not only about the dead. Even the living are dead in Aleppo - in constant fear - often without water and food, and always without refuge."
"The situation is politically complex - but morally simple. Killing children and civilians is wrong. Starving the most vulnerable among us is wrong."