Mazer, 78, enjoyed a literary career spanning more than 30 books, including 1973's "A Figure of Speech" and 1987's "After the Rain," The New York Times reported Sunday.
The novelist earned a reputation for creating believable young characters facing troubling times ranging from separating families to the death of a parent.
In a 1988 interview, Mazer attempted to clarify the intent behind her stories, saying she hoped to offer a moral, not a lecture, to readers.
"I hesitate to say I'm delivering messages," she said. "I'm writing stories and novels. I hope there's an underlying feeling for the reader -- a hope, perhaps a moral. But I'm not preaching. I'm telling stories."
Mazer, who died Oct. 17, is survived by her husband, Harry; her daughters, Anne and Linda Fox; her son, Joseph; two sisters, Adele Machia and Linda Fox; and two grandchildren.