John Segrave, 2nd Baron Segrave (1256–1325) was an English commander in the First War of Scottish Independence.
Segrave commanded the English in Battle of Roslin, and the Battle of Happrew. He also was involved with the execution of William Wallace, and was the one who carried his quarters to their destinations in Scotland. He died a wealthy man.
Born 20 July, about 1256 (aged 39 in 1295), he was the son and heir of Nicholas de Segrave, 1st Baron Segrave, and his wife Maud, daughter of Geoffrey de Lucy, Knt., of Newington, Kent, Cublington, Buckinghamshire, Dallington and Slapton, Northamptonshire, etc., by his wife, Nichole. In 1270 John married Christian, daughter of Sir Hugh de Plescy, Knt., of Hook Norton, Headington, and Kidlington, Oxfordshire, Stottesden, Shropshire, Kidderminster, Worcestershire, etc., by his 1st wife, Isabel, daughter and co-heiress of John Biset. Christian's maritagium included the manor of Stottesdon, Shropshire. At the same time, his sister Amabel married Hugh's son, John de Plescy. After his father-in-law's death, John de Segrave had custody of his lands during the minority of his heir.
In 1277 and 1282 Segrave served in the two major campaigns against Llywelyn ap Gruffudd, Prince of Wales. In October 1287 he went to Ireland, nominating proctors to represent him for one year. On 6 August 1291 he received at Berwick letters of protection for one year on staying in Scotland on the king's service. He was then for a time constantly employed in the wars against the Scots.
On the death of his father in 1295 Segrave, then 39, entered as heir into the possession of his property. He was first summoned to the Bury parliament of November 1296, and was then regularly summoned until his death. On 14 January 1297 Segrave was one of the magnates attending the Hilarytide parliament at York, with the intention of proceeding against the Scots, but the expedition was postponed.
Segrave attached himself to one of the leaders of the growing baronial opposition to the king, in 1297 making an indenture with Roger Bigod, 5th Earl of Norfolk, by which he covenanted to serve the earl, with five other knights. In return he obtained a grant of the earl's manor of Lodene in Norfolk.