Nanny 911 is an American reality television series that originally aired on Fox from November 3, 2004, to February 23, 2007, and on CMT from April 18 to June 6, 2009.

[2] The nanny's first day is spent solely in observing the family dynamics in order to determine a suitable plan of action for changing the children's behavior; at the end of the day the nanny discusses what needs to be done.

At the end of the week, the nanny generally compliments the family for the changed behavior.

The last segment shows the family receiving a substantial gift from the nanny (such as a new car or a home renovation).

In Season Four, Nanny Yvonne did not appear due to budgetary reasons and the format changed.