Maclay may refer to:

Institutions

Places

People

Fictional
Middle name
  • Robert Maclay Widney (1838–1929), California judge and a founder of The University of Southern California
  • Thaddeus Maclay Mahon (1838–1918), soldier, attorney, railroad executive, and Republican US Representative from Pennsylvania
  • William Maclay Awl (1799–1876), alienist, a politician, and mental health hospital administrator from Pennsylvania

See also edit