The Peace Alliance was launched in July 2001 as a local initiative in Haringey. It was the result of a Church–led response to crime in the community. Key partners from the Church, the Home Office, the Metropolitan Police and the Borough Council and community leaders pledged to work together to promote peace in Haringey.

The Peace Alliance quickly built links with local faith, community and voluntary organizations and organised its first Week of Peace in September 2001 which was aimed at celebrating the diversity of culture in Haringey. The Week of Peace was very successful with over 2,000 local residents taking part; statistics gathered illustrated a significant reduction in crime during the Week of Peace, before unfortunately rising to its usual levels after wards. The Week of Peace continues to be a very successful event, engaging up to 5,000 local residents and partners in various activities. The Week of Peace was celebrated across London for the first time in 2004 from the 20th - 26th of September and was a huge success. The next London Week of Peace will be celebrated from the 20th - 27th September 2009.

The Peace Alliance works nationally with key statutory agencies such as the Home Office and the Metropolitan Police advising on key policy issues. It has now been recognized as a successful model for partnership working and is currently working across London and the United Kingdom with several other key organisations.

The Peace Alliance is well known for its work in gun and other violent crimes, youth crime, working with victims and families of victims of crime as well as young people to reduce crime in the communities.