|Profession||Chief of Police|
|First appearance||"Law and Oracle" (6ACV16)|
|Voiced by||Tress MacNeille|
Chief O'Mannahan is the police chief of the New New York Police Department. She was Philip J. Fry's employer in "Law and Oracle". She is revealed to be in a robosexual relationship with URL. When Fry first joined the police department, she was apparently pregnant, as she later gives birth to a daughter in the station's women's bathroom.
- Her name and personality are loosely based on Callahan from Police Academy.
- Her name rhymes with that of her predecessor (Colleen O'Hallahan).
- A deleted scene on the (Volume 6) DVD shows she was meant to appear in ("Overclockwise").