Sarajuddin Abid, district governor said, the first incident took place in Shulgara district of Balkh province when a 16-year-old girl hanged herself for no reasons.
However, investigations are underway, Abid added.
Meanwhile, in a separate incident, an 18-year-old boy committed suicide in Samangan province over financial problems, Samangan police spokesman, Abdul Munir Rahimi said.
The victim was identified as Abdulla who was a resident of Aybak the capital of province.
The officials did not provide further details regarding the incident.