William Munroe was a 17th-century Scottish soldier who later became a settler in the United States and a Freemason.
William was born in 1625, third son of Robert Munro, Commissary of Caithness, who in turn was the third son of John Mor Munro, 3rd of Coul, a descendant of George Munro, 10th Baron of Foulis.
He is one of four men by the surname of Munroe recorded as being captured at the Battle of Worcester in 1651 and transported to America during the Wars of the Three Kingdoms as an indentured servant. He is likely to have been fighting alongside other men from the Clan Munro such as Sir Alexander Munro of Bearcrofts who was fortunate enough to escape.
William is almost certainly one of four men transported on the ship called the John and Sara, though the record of this has been damaged so that his first name is obscured. The names of the other three men are still fully visible on the ship's record.
William Munroe is known to be the ancestor of a vast family of Munroes in New England, United States. William married three times. He remained single for the first thirteen years after his arrival in Massachusetts, finally marrying about 1665. His first bride was Martha George, whose father once worked for Massachusetts governor John Winthrop. At the time of Martha's marriage, her father faced trouble with Puritan authorities for founding an illegal Baptist church in Charlestown. Martha died a few years after the marriage, leaving William to raise four young children.
William then married twenty-year-old Mary Ball of Watertown, a woman with a troubled past. Her parents were in and out of court on charges of beatings and neglect, amid hints that the mother was insane, and Mary herself had suffered judicial sanctions for an out-of-wedlock child. William brought stability to Mary's life, and they had ten children together during their twenty years of marriage.
His third wife was Elizabeth Johnson Wyer, a widow of a Scots tailor from Charlestown.
William began acquiring small pieces of land in Cambridge Farms, which is present-day Lexington, and he and his sons and a son-in-law purchased 100 acres (0.40 km2) in 1695. With increased landholdings came greater status in the community, and he was made a freeman, chosen as one of the town Selectmen, and admitted as a member of the church. William died in 1719.