Sir Andrew Trollope (died 1461) was an English soldier during the later stages of the Hundred Years' War and at the time of the Wars of the Roses.
Born into a family of Durham dyers, Trollope began his long military career in France in the 1420s as a man at arms, serving first on Tombelaine under Thomas Burgh and then with the garrisons at Fresnay-le-Vicomte and Caen under Sir John Fastolf in the Duke of Somerset's raid into Picardy in February 1440. Trollope served in Matthew Gough's company. By 1442 he was lieutenant at Fresnay under Sir Richard Woodville and held the same position under Osbert Mundeford when he surrendered the castle to the French in 1450.
Some time before 1455 he married Elizabeth, sister of Osbert Mundeford (a protégé of the Beaufort family, who became treasurer-general of the duchy of Normandy in September 1448), and this connection allowed Trollope to prosper in his military career. By 1455 Trollope was made Master Porter of Calais, a capacity in which he continued to serve until 1459. It was in this office that he prevented pirates and French ships alike from sailing, but also seized and stole from "the ships of allies and subjects alike" to such an extent that he has been called a "freebooter".
Shortly before the confrontation at Ludford Bridge, Trollope sailed for England with Richard Neville, 16th Earl of Warwick known as ("The Kingmaker"). At the Battle of Ludford Bridge Trollope commanded part of the Yorkist army of Richard of York, 3rd Duke of York, but betrayed him to the Lancastrians, bringing with him "valuable intelligence" regarding York's army.