They were awarded death sentence by the special military courts which were set up following the Peshawar school attack of December 16, 2014 to expedite punishments against people convicted under terror charges.
A military spokesperson said all the accused were active members of the banned Tehreek-e-Taliban Pakistan and were involved in "heinous offences".
"Today Chief of Army Staff confirmed death sentences awarded to another 11 hardcore terrorists, who were involved in committing heinous offences related to terrorism," said a statement issued by the army.
Those convicted included militants who had killed a senior police officer in Balochistan, DIG Fayyaz Sumbal, and army's Major Majeed.
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Other convicts were involved in sectarian killings, kidnapping and killing of civilians and personnel of Frontier Constabulary and army.
They were also charged with the crimes of destroying schools and communication infrastructure.
It is not clear when and where their trials were held and completed, as army courts operate in secrecy due to fear of retaliation by militants.