The fire service said crews were called to an area off the A283 Stopham Road near Pulborough at 11.43am this morning to reports of an individual trapped under a fallen tree.
A spokesman added: “Joint Fire Control mobilised the Technical Rescue Unit along with fire engines from Storrington and Arundel to the scene, as well as a number of senior officers to co-ordinate the rescue.
“Upon arrival they found an adult male trapped under a large log, and worked alongside paramedics from the South East Coast Ambulance Service to help free the individual.”
The man, who the ambulance service said suffered a leg injury, was left in the care of paramedics.
The fire service said the last crew left the scene shortly before 1.30pm.
An ambulance service spokesman added: “We were called at approximately 11.40am today to reports a person had been injured by a tree. Ambulance crews including our Hazardous Area Response Team attended and were joined at the scene by the air ambulance service.
“The person was assessed and treated for a leg injury before being taken to Worthing Hospital by road.”