The Commendation Medal is a mid-level United States medal presented for sustained acts of heroism or meritorious service. Each branch of the United States Armed Forces issues its own version of the Commendation Medal, with a fifth version existing for acts of joint military service performed under the Department of Defense.

The Commendation Medal was originally only a service ribbon and was first awarded by the U.S. Navy and U.S. Coast Guard in 1943. An Army Commendation Ribbon followed in 1945 and in 1949 the Navy, Coast Guard, and Army Commendation ribbons were renamed the "Commendation Ribbon with Metal Pendant". By 1960 the Commendation Ribbons had been authorized as full medals and were subsequently referred to as Commendation Medals.

Additional awards of the Army and Air and Space Commendation Medals are denoted by bronze and silver oak leaf clusters.