William Dickinson Hawley (1784 – January 23, 1845) was an Episcopal clergyman who served as Chaplain of the Senate.
While in New York he also served in the state militia and was court martialed in 1813 for unofficerlike conduct; he was acquitted of the charges against him.
In Hawley's rectorship, Presidential worshipers included President John Quincy Adams who was a regular at afternoon services during his term of office.
Hawley conducted the funeral of President William Henry Harrison in the East Room of the White House on April 7, 1841.
Hawley officiated in the White House for the weddings of Samuel L. Gouverneur to Maria Hester Monroe (the President's youngest daughter) and John Adams II to Mary Catherine Hellen.