Thomas Dacre, 4th Baron Dacre of Gilsland

Thomas Dacre, 4th Baron Dacre of Gilsland, also and de jure Baron Boteler (ca. 1527 – 1 July 1566) was an English Member of Parliament and after his father's death a peer and major landowner in the counties of Cumberland, Yorkshire and Northumberland.

Born about 1527, Dacre was the eldest of the five sons of William Dacre, 3rd Baron Dacre (c. 1493–1563), by his marriage to Elizabeth Talbot, a daughter of George Talbot, 4th Earl of Shrewsbury and of Anne Hastings, a daughter of William Hastings, 1st Baron Hastings. His father was Captain of Norham Castle, Steward of Penrith, Warden of the West Marches 1527–1534 and 1555–1563, and Governor of Carlisle. One of his brothers was Leonard Dacre.

The young Dacre was knighted in 1547. He married first Lady Elizabeth Neville, the sixth daughter of Ralph Neville, 4th Earl of Westmorland, by his marriage to Lady Catherine Stafford, the second daughter of Edward Stafford, 3rd Duke of Buckingham. There were no children of the marriage.