In the video, captured by Michael Fujiwara, the sea lion is seen swimming around the harbour at Steveston Harbour in Richmond, Canada.
The girl sits on a wooden bench above the water when the sea lion lunges at her from below, pulling her into the harbour.
A man jumped in straight after to rescue the girl before they quickly got pulled up to safety.
Fujiwara, who filmed the incident, told CBC the pair left quickly after they got out of the water.
‘They were pretty shaken up. Her family were just in shock,’ he said.
Watch the terrifying footage below.
This article first published on New Idea.