Sir Charles Thomas Dyke Acland, 12th Baronet, DL, JP, of Killerton in Devon and of Holnicote in the parish of Selworthy in Somerset, was a large landowner and a British politician and Barrister-at-Law. He was known to family and friends as "Charlie", but demanded to be known in public as "Sir Thomas", not only because that was the traditional name of the Aclands, there having been a "Sir Thomas Acland" at Killerton for 170 years, but also because following the creation of a second and much newer Acland Baronetcy in 1890, for his uncle Sir Henry Wentworth Acland, 1st Baronet, he wished people to know "which was the real head and owner of Killerton".

There have been four baronetcies created for members of the Acland family, which originated in the 12th century at the estate of Acland in the parish of Landkey, North Devon, two in the Baronetage of England and two in the Baronetage of the United Kingdom.