Commonwealth Electoral Division of: Mayo (South Australia)
- Division name: Mayo
- State: South Australia
- Name derivation: Named after Helen Mayo 1878-1967, co-founder of the Mothers' and Babies' Health Association in 1927 and first woman elected to a University Council of Australia in 1914.
- Size & Location description: Mayo covers an area of approximately 9 190 sq km from Williamstown and Springton in the North to Goolwa in the South. It includes the Adelaide Hills, Fleurieu Peninsula and Kangaroo Island. The metropolitan suburb of Aberfoyle Park is in this division. The country towns include Birdwood (part), Bridgewater, Crafers, Echunga, Gumeracha, Hahndorf, Langhorne Creek, Lobethal, Macclesfield, Mount Barker, Myponga, Oakbank, Stirling, Strathalbyn, Victor Harbor, Woodside and Yankalilla.
- Products/industries of the area: Dairying, beef, sheep, apples, pears, cherries, smallgoods, Kanmantoo copper mines, Jupiter Creek goldfields, forestry, natural spring water, wine, cereals, tourism and the army barracks at Woodside.
- First proclaimed/election: 1984