The verdict by the Cairo Court of Urgent Matters stipulates that members of the group in Egypt will be labelled a "terrorist element," Ahram Online news outlet said.
According to the media, a Hamas spokesperson in Gaza rejected the verdict, describing the decision as political.
"Al-Qassam Brigades are the symbol of resistance against the Israeli occupation, and a symbol of the [Palestinian] nation's pride and dignity, despite all attempts at defamation," spokesman Sami Abu Zuhri wrote on his official Facebook page, according to the media.
In August 2012, an attack blamed on Hamas at a military post in northern Sinai killed 16 Egyptian soldiers. Two armored cars were also stolen and used to enter Israel. Among 32 so-called terrorists named by the lawyer, three were claimed to be affiliated with Hamas.
In December 2014, the EU Court of Justice ruled to remove Hamas from the EU list of terrorist organizations. Israel, Canada, the United States and Japan consider Hamas a terrorist organization. Hamas is banned in Jordan, with its military wing outlawed in Australia and Britain. Russia, Iran, China, Qatar and Turkey do not classify Hamas a terrorist group.