John Cairnes was an Irish politician.
He was the son of Thomas Cairnes and his wife Jane Scott, daughter of John Scott.[1] In 1639, Cairnes was elected as Member of Parliament for Augher, representing the constituency in the Irish House of Commons until the following year.[2]
He married Jane Miller, daughter of James Miller.[1] Cairnes's oldest son Alexander was created a baronet and was succeeded by his younger brother Henry.[1] Like his second son William, both sat also in the Parliament of Ireland.[3]