Shell casings were found near the intersection of Banff and Ledbury avenues around midnight Thursday.
Ottawa police said there were no reports of injuries and no suspects have been identified.
It follows another report of shots fired near the intersection of Walkley Road and Cedarwood Drive on Tuesday night.
There were no reported injuries and no arrests there either, police said.
Ottawa police are investigating a report of shots fired in south Ottawa for the second straight day. 0:30