Judge says death penalty will not assuage the victims and give closure to indelible pain suffered.
Five terror convicts received life terms for the 2010 suicide attacks, while two others received 50-year sentences.
A Ugandan court on Friday sentenced the convicted mastermind of twin bombings targeting football fans in Kampala that killed 76 people to life in prison.
Four accomplices also received life terms for the 2010 suicide attacks, while two others received 50-year sentences.
"I do not think that the death penalty would assuage the victims and give closure to the indelible pain that society has suffered," Judge Alfonse Owiny-Dollo said.
The attacks claimed by Somalia's Al-Shabaab jihadist group targeted fans watching the World Cup final between the Netherlands and Spain at a restaurant and at a rugby club in the Ugandan capital.
Of the 13 men tried, seven were convicted and found guilty of terrorism, murder and attempted murder.
Five others were acquitted of those charges, while another was acquitted of lesser crimes.