Thomas Derrick (1885–1954) was an English artist, particularly known for his work as an illustrator and cartoonist.

[4] In 1924 Derrick co-designed three posters for the Underground Electric Railways Company of London, and was the sole artist of a fourth in 1927.

[6] He moved in broadly "traditionalist" artistic and intellectual circles, numbering among his friends Hilaire Belloc, G. K. Chesterton, Ananda Coomaraswamy, Ernest William Tristram, and Vincent McNabb, the last-named being the priest who received him into the Roman Catholic Church.

Derrick lived for some years at Cold Ash, Berkshire, and his sons, Michael and Christopher, attended the nearby Douai School.

Derrick, who was a friend of the headmaster, Dom Ignatius Rice, designed the bookplates for the monastery library and for the school's Bede Library (opened 1937), contributed sketches to the Douai Magazine, and painted portraits of some of the abbots and headmasters.