Esq is the abbreviation for esquire, which is a title used by attorneys in the United States. Esq. is written after a lawyer's name, for example: John Smith, Esq .This usage applies to both male and female lawyers. This form of address is not used in the first person. It is used only when the reference is in the third person, such as addressing an envelope, making a formal introduction, or on business letterhead. Esq. is never used with any prenominal form of address, such as Dr., Mr., or Ms.
In English law, term esquire has a different meaning. It is used to signify a title of dignity, which ranks above gentleman and directly below knight.