Rain has been falling steadily since Saturday, leading to the landslides, the Philippine Inquirer Mindanao reported.
A 7-year-old girl was killed early Sunday morning when a landslide hit the village of Mount Diwata, and seven others were injured.
Three people are still missing in the area.
Four others died in Davao Oriental when a landslide hit the Tarragona town Saturday night, and another landslide killed a 7-year-old, the Inquirer reported.
Floods in Agusan del Sur also killed a toddler, who drowned behind his house on Sunday.
Two thousand people from Davao del Norte have fled to safer ground due to the landslides, authorities said Sunday.
Flooding, which was reported in many areas Sunday morning, has destroyed many roadways and bridges, police said.