Businessperson and politician from Northern Ireland
Joseph Foster Cairns (27 June 1920 – 2 May 1981) was a unionist politician in Northern Ireland.
Cairns was the managing director of a furniture retailer, and chairman of a development company. He was elected to the Belfast Corporation for the Ulster Unionist Party, and served as Lord Mayor of Belfast from 1969 to 1972. At the 1969 Northern Ireland general election, he stood in Belfast Oldpark, but was not elected. Cairns died in May 1981 at the age of 60.