A bomb in a horse-drawn wagon exploded in front of 23 Wall Street in New York City, killing 38 people and injuring several hundred others.

The Wall Street bombing was an act of terrorism on Wall Street at 12:01 pm on Thursday, September 16, 1920. The blast killed 30 people immediately, and another eight later died of wounds that they sustained in the blast. There were 143 seriously injured, and the total number of injured was in the hundreds.

23 Wall Street is a four-story office building in the Financial District of Manhattan in New York City, at the southeast corner of Wall Street and Broad Street. Designed by Trowbridge & Livingston in the neoclassical style and constructed from 1913 to 1914, it was originally the headquarters of J.P. Morgan & Co. Since the late 2000s, the building has remained unoccupied for long periods, although it has occasionally been used for events.