Ashraf Jehan, 56, who was serving as an additional judge at the high court in southern Sindh province, made history as she took the oath in Karachi.
"It was a historic oath-taking ceremony today when an able lady judge had joined the Shariat Court," Agha Rafiq Ahmed, the chief justice of the Federal Shariat Court of Pakistan, told AFP.
"There was no bar in the constitution to make a woman the judge of Shariat Court and there is no discrimination between men and women," Ahmed said.
The chief justice of the Shariat Court, who rarely speaks to the media, said he was pleased to comment on an historic moment.
"I took the initiative as it would send the message in the world that we are enlightened people and would dispel many misconceptions," he said.
(APP)