The 77-year-old was reportedly diagnosed after a routine yearly mammogram and is currently undergoing treatment.
"All her doctors say she is in fantastic physical shape and should recover very well," manager Sue Cameron said.
Novak, who is best known for her starring role in the 1958 Alfred Hitchcock movie "Vertigo," has also had notable roles "Picnic," "Pal Joey" and "Bell, Book and Candle."
Novak retired from acting in 1991, however made a rare appearance in July to tape interviews promoting a DVD box-set of five films she did with Colombia Pictures.
She has since been living with her veterinarian husband, Dr. Robert Mallo, in Oregon.
