Thomas, 2nd Earl of Lancaster, English politician, Lord High Steward of England (b. 1278)

Thomas of Lancaster, 2nd Earl of Lancaster, 2nd Earl of Leicester, 2nd Earl of Derby, jure uxoris 4th Earl of Lincoln and jure uxoris 5th Earl of Salisbury (c. 1278 – 22 March 1322) was an English nobleman. A member of the House of Plantagenet, he was one of the leaders of the baronial opposition to his first cousin, King Edward II.