Sir Thomas Dyke Acland, 9th Baronet (18 April 1752 – 17 May 1794) of Killerton in Devon and Holnicote in Somerset, was a prominent landowner and member of the West Country gentry. He was especially noted for his passion for staghunting, in which respect he took after his father. Like his father he was known locally in Devon and Somerset as "Sir Thomas his Honour".
He was the second son of Sir Thomas Dyke Acland, 7th Baronet (1722–1785) of Killerton in Devon and Petherton Park in Somerset, by his wife Elizabeth Dyke (died 1753), daughter and heiress of Thomas Dyke of Tetton, Holnicote and Pixton in Somerset. The ancient Acland family, believed to be of Flemish origin, originated at the estate of Acland in the parish of Landkey in North Devon, where it is first recorded in 1155.
He succeeded his seven-year-old nephew Sir John Dyke Acland, 8th Baronet (1778–1785) as 9th Baronet on the latter's death in April 1785. According to tradition he had become estranged from his father and had quarrelled with his elder brother Col. John Dyke Acland (1747–1778) and had consequently moved away from the family estates. It was during a chance visit to his old home that he learned of his succession to the baronetcy and the vast family estates.
He attended Eton College and University College, Oxford.
He had a propensity to get into debt, and thus his father had avoided bequeathing him a large sum of capital he might squander. His elder brother had predeceased their father, and had left an infant son as heir to the baronetcy. His life was largely dedicated to staghunting and he followed his father into the Mastership of the North Devon Staghounds. He virtually abandoned the family's main seat of Killerton in mid-Devon, and lived chiefly at Holnicote and Highercombe, near Dulverton, situated at the north and south edges respectively of the ancient royal forest of Exmoor, renowned for its herds of Red Deer. His hospitality to his fellow staghunters was legendary, as had been that of his father. During the period 1785 to his death in 1794 he killed 101 stags, the heads and antlers of many of which are still displayed in the stables at Holnicote. He was a stern employer of his hunt-staff, and on one occasion when his hounds had killed several sheep, possibly belonging to his farming tenants, he ordered his huntsman "to hang himself and the whole pack".