| Merchant Marine Combat Bar | |
| Presenter: | United States Maritime Administration |
| Type: | Individual Award |
| Awarded For: | Under enemy attack |
| Campaign: | Second World War |
| Status: | No longer issued |
| Established: | May 10, 1943 |
| Total Awarded: | 114,145 |
| Higher: | Merchant Marine Mariner's Medal |
| Lower: | Merchant Marine Defense Bar |
The Merchant Marine Combat Bar was a decoration of the United States Merchant Marine. The decoration was established by an Act of Congress on 10 May 1943.
The decoration was awarded to members of the Merchant Marine who served on a ship when it was attacked or damaged by an enemy or an instrument of war, such as a mine during the Second World War. This award is a ribbon bar only. Further prescribed is the issuance of a silver star to be attached to such a bar to seamen who are forced to abandon ship when it is so attacked or damaged. For each additional abandonment, an additional star is attached. It is no longer awarded.