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 holiday was created on October 1, 1961, under authorization from Congress for the President to designate May 15^th to honor police officers.   President John F. Kennedy signed the bill into law on October 1, 1962. The proclamation read:

87th Congress of the United States of America

H.J. Res. 730 October 1, 1962 Public Law 87-726

Joint Resolution 76 Stat. 676.

To authorize the President to proclaim May 15 of each year as Peace Officers Memorial Day and the calendar week of each year during which such May 15 occurs as Police Week.

Whereas the police officers of America have worked devotedly and selflessly in behalf of the people of this Nation, regardless of the peril or hazard to themselves; and

Whereas these officers have safeguarded the lives and property of their fellow Americans; and

Whereas by the enforcement of our laws, these same officers have given our country internal freedom from fear of the violence and civil disorder that is presently affecting other nations;

Whereas these men and women by their patriotic service and their dedicated efforts have earned the gratitude of the Republic: Now, therefore, be it Resolved by the Senate and the House of Representatives of the United States of America in Congress assembled, That the President is authorized and requested to issue proclamations (1) designating May 15 of each year as Peace Officers Memorial Day in honor of the Federal, State, and municipal officers who have been killed or disabled in the line of duty, (2) directing the officials of the Government to display at half-staff the flag of the United States on all Government buildings on such day, as provided by section 3(m) of the Act of June 22, 1942 (Chapter 435; 56 Stat. 377; 36 U. S. C. 175), (3) designating in each year the calendar week during which such May 15 occurs as Police Week, in recognition of the service given by the men and women who, night and day, stand guard in our midst to protect us through enforcement of our laws, and (4) inviting the governments of the States and communities and the people of the United States to observe such day and week with appropriate ceremonies and activities, including the display at half-staff of the flag of the United States.

Approved October 1, 1962.

To pay tribute to the law enforcement officers who have made the ultimate sacrifice for our country and to voice our appreciation for all those who currently serve on the front lines of the battle against crime, the Congress, by a joint resolution approved October 1, 1962 (75 Stat.676), has authorized and requested the President to designate May 15 of each year as "Peace Officers Memorial Day," and the week in which it falls as "National Police Week" and by Public Law 103-322 (36 U.S.C. 175) has requested that the flag be flown at half-staff on Peace Officers' Memorial Day.