This document discusses how OpenStreetMap data and volunteers helped respond to the 2010 Haiti earthquake. It describes how within a week of the earthquake, over 700 volunteers had mapped Haiti using satellite imagery. The highly detailed maps helped first responders locate roads, buildings, and camps. Damage assessments were also mapped. The UN noted that mapping Haiti normally would have taken years but OSM did it in just 3 weeks. OSM data continues to help with ongoing crisis response and reconstruction efforts in Haiti through tools like the Humanitarian Data Model and deployments of the OSM Humanitarian Team.