Henry de Beaumont, 1st Baron Beaumont

Henry de Beaumont (1280–1340) was an English baron, son of Louis of Brienne, and a leader of the Disinherited, the nobles whose Scottish lands Robert I had forfeited. A household knight of Edward I, he fought at Falkirk, where Wallace's spearmen killed his horse under him.

By 1310 he had married Alice Comyn, heiress of the earldom of Buchan, and claimed it in her right. In 1331 he persuaded Edward Balliol to come to England and helped plan the invasion of 1332, which won Dupplin Moor and Balliol's crown at Scone.

After Halidon Hill he returned to Buchan and rebuilt Dundarg Castle, where Andrew Murray besieged him and forced his surrender on 23 December 1334. He followed Edward III to the Low Countries in 1338 and died there in 1340. His son John never claimed Buchan, and the Comyn line of Buchan ended with Alice's death in 1349.