On September 11, 2002, various memorials and services across the world marked the first anniversary of the September 11, 2001 attacks, the greatest number being in Manhattan. Church bells tolled at 8:46 am, when the first plane struck, and 10:29 am, when the second tower fell. Churches and other public spaces were open the entire day.

Remembrance services were held throughout the USA.

The ceremony at New York, broadcast throughout the world, fell an hour behind schedule, but was well attended. The ceremony included the reading out of the names of all the persons who died there (on both the planes and the World Trade Centre) and the recitals of American historical speeches such as the Gettysburg Address. Moments of silence were observed at 8:46 AM and 9:03 AM, the moments when the two planes struck the two towers, and church bells rang at 10:29 AM, the moment at which the second tower collapsed.

The private ceremony at the Pentagon was also well-attended, and included the President among its participants. A prayer was said at the end that referred to Todd Beamer's "Let's Roll" remark.

The public ceremony at Shanksville also had a large turnout. It included two flybys and a release of doves. President George W. Bush attended a private followup service for the families of Flight 93's victims in the afternoon.