Debbie Wolowitz (aka Mrs. Wolowitz) is Howard Wolowitz's mom in The Big Bang Theory. Unlike every other character on The Big Bang Theory, Mrs. Wolowitz is the only one to never be seen. Her loud, slow, obnoxious voice can be heard in the background of most conversations with Howard.

Mrs. Wolowitz was a recurring and funny character on the show, known for her loud conversations with Howard and her close relationships with other characters. Despite never being seen on screen, Mrs. Wolowitz's presence was larger than life, and the show paid tribute to Carol Ann Susi after her death with a heartfelt message.