William Binchy is an eminent professor of law in Trinity College Dublin, Ireland.

He has been involved in a number of campaigns in connection with proposed amendments of the constitution of Ireland. In particular, he campaigned:

• in favour of the constitutional ban on abortion in 1983 (successfully);

• against the introduction of divorce in Ireland (successfully in 1986, and unsuccessfully in 1995);

• against the restriction of the automatic, constitutional right to citizenship of all of those born on the island of Ireland (unsuccessfully in 2004).

William Binchy is the brother of novelist Maeve Binchy.