McIntosh was known prior to the mid-1970s as Sue Donovan, from her marriage to actor Terence Donovan, which started in 1965 and ended in divorce in 1973. Their son is Australian actor/singer Jason Donovan, from whom she is estranged. Her maiden name was Menlove, as confirmed in the BBC1 program Who Do You Think You Are?, broadcast on 30 August 2010. She has been married to John McIntosh since 1974. They have three daughters: Katherine, Olivia and actress Stephanie McIntosh.
