|Died:||1989; New York|
Head of the New York Institute
Marian Whitelaw was a Shadowhunter and the former head of the New York Institute. She was the wife of Adam Whitelaw and the aunt of Rachel Whitelaw. Unable to have children of their own, the couple adopted Rachel and some other Whitelaw cousins after the death of their parents, caring for her as if they were their own.
- The Last Stand of the New York Institute (first and only appearance)