Nomansland Common (sometimes simply called No Man's Land) is an area of common land in Hertfordshire, England to the south of Harpenden and the south-west of Wheathampstead
Geologically, the common is part of the Harpenden Dry Valley. In the last ice age a glacier dammed the river (which then flowed from Dunstable) south of Sandridge into St Albans Vale, creating a lake. When the dam melted and water drained away, it left the thin, stony soil still found on the common today. Nomansland has, throughout its history, been recognised for uniquely poor soil quality for agricultural purposes, although flint axe heads suggest that the common may have been cleared for grazing as long ago as 4000 BC. In World War II attempts were made to plant crops on the common, but the common yielded less than half of the produce per unit area as other arable land, despite heavy use of fertilisers. After the end of the war, the land was re-seeded as grass and returned to recreational use.
Nomansland Common, as its name implies, is extra-parochial, and was the source of frequent disputes between the monastery of St Albans and that of Westminster, both claiming it to be within their respective dioceses, and the manors of Sandridge and Wheathampstead. It is now divided between the parishes of Wheathampstead and Sandridge. In 1427 the abbot of Westminster erected a gallows there, which the servants of St Albans Abbey promptly destroyed. In 1428 a shepherd died on the common and the Vicar of Sandridge claimed the body for burial, but the men of Wheathampstead spirited the corpse away and buried it in their churchyard. In 1429 a jury agreed that both abbeys should share grazing rights and beat the boundaries according to their own claims.
In 1460 the Second Battle of St Albans was fought on Bernards Heath, and part of the conflict (the flight of the Yorkists) occurred on the common. In the 18th century, cannonballs and 25 skeletons were recovered from the site, and are believed to date from the battle.