The bombs were dropped from planes and helicopters, with many of the strikes taking place near the main north-south highway running through the northwestern town of Maaratal-Numan, HRW said in a report.
Rebels seized Maarat al-Numan from President Basharal-Assad's troops last week, cutting the route from the capital Damascus to Aleppo, Syria's biggest city. Government forces have been trying to retake the area since then.
HRW previously reported Syrian use of cluster bombs, which have been banned by most countries, in July and August but the renewed strikes indicate the government's determination to regain strategic control in the northwest.
Cluster munitions can drop hundreds of bomblets on a wide area as an anti-personnel weapon, designed to kill as many people as possible. Human rights groups say their use in civilian-populated areas can be a war crime.
More than 100 nations have banned their use, stockpiling, transfer or sale under a convention which became international law in 2010, but Syria has not signed it, nor have Russia, China or the United States.
Bomblets that do not initially explode can litter the ground, killing and maiming civilians long after a war is over.
Towns targeted included Maarat, Tamanea, Taftanaz and al-Tah. Cluster bombs have also been used in other areas in Homs, Aleppo and Lattakia provinces as well as near Damascus, the New York-based rights group said.
"Syria's disregard for its civilian population is all too evident in its air campaign, which now apparently includes dropping these deadly cluster bombs into populated areas," said Steve Goose, arms director at HRW. (Cnewsworld)
