The Syrian Observatory for Human Rights also said that at least 10 people were reported killed today in regime shelling of the northwestern province of Idlib.
The deaths in Khan al-Assal, northern Syria, came as the regime tried to recapture the town, which fell to rebel fighters on Monday.
More than 50 of those killed were executed by rebels after the town fell, with the rest having died in fighting, the Observatory said, adding that 30 of the dead were officers.
Amateur video filmed by rebels and distributed by the Observatory showed the bodies of dozens of regime forces in a building that had been the site of a battle.
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The mainstream rebel Ninth Division claimed its fighters took Khan al-Assal. But footage distributed by the Britain-based Observatory said jihadists including Al-Nusra Front were behind the takeover.
Fierce fighting raged in March in Khan al-Assal during eight days in which 200 rebels and government forces were killed.
During a visit to Damascus by two UN envoys earlier this week, Syrian authorities reiterated their demand that the United Nations focus on investigating the alleged use of chemical weapons in Khan al-Assal.
Khan al-Assal's fall from regime control has complicated any effort to send in inspectors to visit the site.
Elsewhere in Syria, the Observatory reported 10 people killed and several others wounded in regime shelling of the Idlib village of Basamis today.
The Observatory, which relies on a vast network of activists on the ground and medics for its information, said at least 85 people were killed throughout Syria yesterday, including 29 civilians, 32 rebels and 24 soldiers.