|Relatives:||John Grayson (husband, deceased), Dick Grayson (son)|
|Voiced by:||Diane Pershing (uncredited)|
Mary Grayson was the mother of Dick Grayson.
Together with her husband and son, Mary formed the Flying Graysons, an acrobatic team performing for Haley's Circus. They performed death-defying stunts without the aid of a net. One night, they performed their usual act, unaware that Tony Zucco had sabotaged the trapeze. During the show, in front of the entire crowd and young Dick, John and Mary fell to their deaths when the line snapped.