Montgreenan is an estate in North Ayrshire, Parish of Kilwinning, Scotland. The Lugton Water runs through the policies and farmland of Montgreenan. Nearby are the hamlets of Torranyard and Auchentiber.
The name 'Grenane' is recorded in 1480, however the first detailed reference to Montgreenan is contained in the description of the ancient county of Cuninghame by Timothy Pont in the period 1604-1608. In it he describes 'Mongrynen Castle' as "…ane old strong Dunijon veil and pleasantly planted ye inheritance of Cuninghame Laird thereof sone to the abott of Kilwinin quho wes brother to James Earle of Glencairne”. The 10 merk land of Montgreenan was held in the 15th century by the Ross family, who had many lands in Ayrshire, such as those of Dunlop and its castle. The Rosses held their lands as vassals of the De Morvilles.
Following the murder of James III of Scotland, Sir John Ross de Montgreenan lost all his lands, only to rapidly return to royal favour under the rule of James IV and regain the Manor or Barony of Montgreenan. The manor or barony is said to have passed to the Monastery of Kilwinning and then to Alexander Cunninghame and his wife Jean Blair in 1582 - 83 following the reformation, of which, Alexander had been a prominent supporter. Alexander Cunninghame, the Commendator of Kilwinning Abbey, was shot and killed at his gate at Montgreenan by Sir Robert Montgomerie of Skelmorlie (better known for building the Skelmorlie Aisle as his burial place) on 1 August 1586, as a direct result of the assassination of Hugh Montgomerie, 4th Earl of Eglinton at Stewarton in April of that year. Lady Jean Cunninghame died in 1621, leaving the lands to her son William, and by 1632 Alexander Cunninghame, a grandson of Lady Jean was the owner, succeeded by his son Thomas in 1656. Thomas's son, of the same name, fought at the Battle of Bothwell Bridge and was sentenced to death for his actions. His life was spared, however his lands were forfeited and given to Lieutenant-General Douglas who sold it on to High Stevenson, clerk to the Privy Council. In 1691 the Hearth Tax records show the mansion house with seven and five other dwellings associated with the 'Lands of Montgreenan'.