The Serious Incident Response Team of Newfoundland and Labrador (SIRT-NL) is a civilian-led police oversight agency responsible for conducting investigations into incidents involving death, serious injury, sexual offence, domestic violence or any matter of significant public interest that may have arisen from the actions of a police officer in the province.

The team consists of a civilian director and a blend of civilian investigators and investigators seconded from the Royal Newfoundland Constabulary and the Royal Canadian Mounted Police. All investigators report to the Director, who must never have been a police officer.

The director and investigators of SIRT-NL have authority under the Serious Incident Response Team Act to lay criminal charges against police officers when the evidence gathered during an investigation provides grounds to believe a criminal offence has been committed. All investigative decision making and the decision to issue a public report, lay a charge or refer a matter to Crown counsel are independent from government.