The blaze broke out in the intensive care and maternity departments of the Jazan General Hospital, the Civil Defense Agency tweeted.
The fire is now over and those injured have been transferred to other hospitals in the area, it added.
An investigation is under way to find out the cause of the blaze.
One witness told Saudi TV an electrical fault appeared to be to blame, and that the fire had swept through the building in minutes.
“We could hear the women screaming,” the man said.
The fire badly damaged the interior, charring walls and leaving wreckage dangling from the ceiling.
Twenty-one civil defense teams helped extinguish the fire, according to the agency.
Some Saudis took to social media to complain of what they said was inadequate infrastructure in the area.
Saudi authorities also faced heavy criticism earlier this year after a stampede at the Hajj pilgrimage killed hundreds.
Jazan is near the border with Yemen, which has seen months of fighting between Houthi rebels and Saudi-backed forces.
The US House Ethics Committee has voted to release its report on former Republican Representative…
ABC News has agreed to pay $15 million to President-elect Donald Trump to settle a…
South Korea’s parliament has voted to impeach President Yoon Suk Yeol over his failed attempt…
Israeli war planes have carried out more than 100 air strikes in Syria on December…
President-elect Donald Trump has threatened to impose 100% tariffs on the BRICS countries if they…
Syrian troops have withdrawn from the city of Aleppo following an offensive by rebels opposed…