Frederick Albert McDonald (7 December 1872 – disappeared April 1926) was an Australian politician. He was a Labor member of the Australian House of Representatives for Barton from 1922 until 1925, when he was narrowly defeated by Nationalist Thomas Ley. McDonald was challenging the election result in court when he mysteriously disappeared in 1926. It is widely suspected that Ley, who later died in an insane asylum in England after committing murder and had several other rivals die in mysterious circumstances, was responsible for McDonald's disappearance.