Campaign Zero is an American police reform campaign launched on August 21, 2015. The plan consists of ten proposals, all of which are aimed at reducing police violence. The campaign's planning team includes Brittany Packnett, Samuel Sinyangwe, DeRay Mckesson, and Johnetta Elzie. The activists who produced the proposals did so in response to critics who asked them to make specific policy proposals. Subsequent critics of Campaign Zero and of their 8 Can't Wait project point out that some of the policies it recommends are already in place as best practice policies at many police departments. Some of these include the Milwaukee policing survey and the PRIDE act. However, a 2016 study by Campaign Zero found that only three of the eight policy recommendations were adopted by the average police department and that no law enforcement agency had adopted all eight.

Since its inception, Campaign Zero has collected and proposed policy solutions for police reform in ten areas.

Arriving on the heels of protests in Ferguson, New York, Baltimore, and elsewhere over cases of civilians being killed by police officers, Campaign Zero in August 2015 was launched as a "data-driven platform" with the goal of ending police brutality. The same team had created the project MappingPoliceViolence.org four months prior, which tracked and mapped incidents of police violence.

In November 2015, the campaign released its first research report, which examined the use of body cameras in police forces in 30 cities and the fairness, transparency, privacy, and accountability associated with body camera policies. Data about the policies of 17 cities is maintained on a live spreadsheet.

In December 2015, the campaign released a second report, a review of police union contracts in 81 cities, along with an associated campaign called "Check the Police" that seeks to mobilize activists to pursue changes in such contracts. The report examined ways in which union contracts delay interrogations, allow officer personnel files to be erased, disqualify complaints, and limit civilian oversight. An actively updated database of contracts and analysis is maintained by the campaign online.

In June 2016, the campaign continued its work on police union contracts with the release of its third report, "Police Union Contracts and Police Bill of Rights Analysis." This report focused on use of force policies and evaluated protections in those policies for civilians.

Because many of the policies Campaign Zero recommends are already in place in some police departments, Slate contributor Ben Mathis-Lilley has said that with the launch of its site, Campaign Zero "is saying to mainstream politicians: Here are some products that have been sold before—now do your job." Harold Pollack has stated that the document in which the campaign announced its proposals is "a very useful and professional document", and that certain proposals it made, such as increasing police diversity and reducing the use of monetary punishments to raise revenue, seemed "particularly smart."

On January 19, 2016, it was ranked as one of 20 tech insiders defining the 2016 United States presidential election by the staff of Wired.