The verdict comes after four Afghan men were sentenced to death and eight others were handed a 16-year jail term earlier this month for the killing of 27-year-old Farkhunda.
“You are sentenced… for negligence of duty to one year in prison,” Judge Safiullah Mojaddidi told the 11 defendants, which included senior officers, while eight other policemen were found not guilty.
“This verdict is not final and the defendants have the right to appeal,” the judge added.
A furious mob turned on Farkhunda on March 19, beating her in broad daylight and setting her body ablaze on the banks of the Kabul River.
Forty-nine people were arrested, including 19 police officers, some of whom were shown standing by and doing nothing to stop the mob in cellphone videos recorded by bystanders.
The attack came after an amulet seller, whom she had reportedly castigated for peddling superstition, falsely accused her of burning the Quran.
Her killing triggered protests around Afghanistan and drew global attention to the treatment of Afghan women.