Saudi Arabia executes more Pakistanis than any other foreign nationality annually, nearly all for heroin smuggling, according to the study by Justice Project Pakistan and Human Rights Watch.
In 2013, a court had sentenced 152 soldiers to death for the 2009 killings in which dozens of officers were shot, hacked to death or burnt alive before being dumped into sewers or shallow graves.
Four men and three women were hanged. They included a member of the ruling Al Sabah family and five foreigners.
The 15 men sentenced to death were among 32 people who were detained in 2013 on charges of spying for Iran. They went on trial in February.
The decision means death row inmate Imdad Ali, who "hears voices in his head that command him" and was diagnosed with the mental illness, could be executed as early as October 26.
Supreme Court of Bangladesh confirms death sentence for Jamaat-e-Islami's leader Motiur Rahman Nizami over war crimes.
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