Peace Officers Memorial Day and Police Week is an observance in the United States that pays tribute to the local, state, and federal peace officers who have died, or who have been disabled, in the line of duty. It is celebrated May 15 of each year. The event is sponsored by the National Fraternal Order of Police (FOP) and is implemented by the FOP Memorial Committee.

The National Fraternal Order of Police (FOP) is a fraternal organization consisting of sworn law enforcement officers in the United States. It reports a membership of over 355,000 members organized in 2,100 local chapters (lodges), state lodges, and the national Grand Lodge. The organization attempts to improve the working conditions of law enforcement officers and the safety of those they serve through education, legislation, information, community involvement, and employee representation.