George J. Fisher (2 April 1871 – 1960) was a physician and leader in the fields of youth development and physical fitness in the United States during the early twentieth century.

He conducted early experiments on the effects of smoking which found that it increases blood pressure and heart rate.

Fisher is best remembered for making volleyball a part of the program in military training camps, both in the United States and abroad while serving as Secretary of the YMCA War Work Office With the beginning of World War I, volleyball spread worldwide.

Fisher included volleyball in the recreation and education program for American armed forces as early as 1914 and American soldiers fighting in World War I played volleyball on the beaches of Normandy and Brittany.

In 1919 Fisher made volleyball a part of the program in military training camps, both in the United States and abroad.