Patriot Day is an annual observance on September 11 to remember those who were injured or died during the terrorist attacks in the United States on September 11, 2001. Many Americans refer Patriot Day as 9/11 or September 11.

On the direction of the President, the flag of the United States of America should be displayed on the homes of Americans, the White House and all United States government buildings in the whole world. The flag should be flown at half-staff as a mark of respect to those who died on September 11, 2001.

Many people observe a moment of silence at 8:46 AM (Eastern Daylight Time) each September 11th. This marks the time that the first plane flew into the World Trade Center.

This is the 18th anniversary of 9/11, the National September 11 Memorial & Museum website will commemorate the anniversary with the annual reading of the names. Family members will read the names of the 2,983 men, women and children killed in the attacks at the World Trade Center, the Pentagon, aboard Flight 93 and in the 1993 WTC bombing.