Notification techniques for wireless power transfer systems are described. In one embodiment, for example, an apparatus may comprise a power transmitting unit (PTU) and logic, at least a portion of which is in hardware, the logic to initiate an extraneous object detection procedure to check for a presence of extraneous objects within a transfer field of the PTU during operation of the PTU in a power transfer state, and in response to a detection of an extraneous object, send an extraneous object notification message to a power receiving unit (PRU) and determine whether to maintain the PTU in the power transfer state based on a determination of whether the extraneous object comprises a rogue object. Other embodiments are described and claimed.