The title for the head or chief bridesmaid who is unmarried is Maid of Honor.
The Maid of Honor is:
- Someone close to the bride who will act as the bride’s right hand
- Responsible for hosting the bridal shower
- Holds the bride’s bouquet during the wedding ceremony
- Holds the ring destined for the groom until requested during the wedding ceremony
The title for this person when she is married is Matron of Honor.
The title for this person when he is male is Man of Honor.
Merriam-Webster Online Dictionarymaid of honor ()
an unmarried lady usually of noble birth whose duty it is to attend a queen or a princess
a bride's principal unmarried wedding attendant - compare matron of honor