| GCB | |
| —abbreviation for | |
| (Knight) Grand Cross of the Bath (a Brit title) | |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| GCB Knight of the Grand Cross, Order of the Bath |