Winifred Margaret Piesse, née Aumann (12 June 1923 – 11 March 2017) was an Australian politician.
She was the first woman to represent the Country Party in the Western Australian Legislative Council.
She attended local state schools and trained as a nurse – working in Melbourne from 1944 to 1946, when she moved to Western Australia.
Following her husband's death in 1966, she returned to nursing and in 1971, she was elected to Wagin Shire Council.
In 1977, she was elected to the Western Australian Legislative Council, serving until she lost her seat in 1983.