The men, who were also convicted of multiple counts of murder and attempted murder, could face the death penalty in sentencing Friday. Another suspect was convicted of aiding and abetting terrorism, while five others were acquitted.
In convicting the seven men, High Court Judge Alphonse Owiny Dollo said there was proof that the July 2010 bombings were planned in Somalia and that explosives used in the attack were ferried through Kenya.
The 13 suspects including Ugandans, Kenyans and Tanzanians were charged under Uganda's anti-terror law. FBI agents testified during the trial in Kampala.
The 2010 attacks targeted a rugby club and an Ethiopian-themed restaurant where customers were watching the World Cup final on giant screens. A third bomb planted elsewhere in Kampala failed to detonate.
The attacks were claimed by the Somali Islamic extremist group al-Shabab, which opposes Ugandan military involvement in Somalia. The group has since carried out even deadlier attacks in neighboring Kenya, which in 2011 deployed peacekeepers to Somalia.