Tenney Frank was a prominent American ancient historian and classical scholar. He studied many aspects of Ancient Rome, for instance its economy, imperialism, demographics and epigraphy.

Publius Terentius Afer, better known in English as Terence, was an African Roman playwright during the Roman Republic. His comedies were performed for the first time around 166–160 BC. Terentius Lucanus, a Roman senator, brought Terence to Rome as a slave, educated him and later on, impressed by his abilities, freed him. It is thought that Terence abruptly died, around the age of 25, likely in Greece or on his way back to Rome, due to shipwreck or disease. He was supposedly on his way to explore and find inspiration for his comedies. His plays were heavily used to learn to speak and write in Latin during the Middle Ages and Renaissance Period, and in some instances were imitated by William Shakespeare.

Terry Gene Carr was an American science fiction fan, author, editor, and writing instructor.

Terry Southern was an American novelist, essayist, screenwriter, and university lecturer, noted for his distinctive satirical style. Part of the Paris postwar literary movement in the 1950s and a companion to Beat writers in Greenwich Village, Southern was also at the center of Swinging London in the 1960s and helped to change the style and substance of American films in the 1970s. He briefly wrote for Saturday Night Live in the 1980s.

Thaddeus Mason Harris was a Harvard librarian, Unitarian minister and author in the early 19th Century. His most noted book was The Natural History of the Bible first published in Boston in 1793.

Thea Gabriele von Harbou was a German screenwriter, novelist, film director, and actress. She is remembered as the screenwriter of the science fiction film classic Metropolis (1927) and for the 1925 novel on which it was based. von Harbou collaborated as a screenwriter with film director Fritz Lang, her husband, during the period of transition from silent to sound films.

Theocritus was a Greek poet from Sicily, Magna Graecia, and the creator of Ancient Greek pastoral poetry.

Theodor Hertzka, or Hertzka Tivadar was a Jewish-Hungarian-Austrian economist and journalist.

Christian Matthias Theodor Mommsen was a German classical scholar, historian, jurist, journalist, politician and archaeologist. He is widely regarded as one of the greatest classicists of the 19th century. His work regarding Roman history is still of fundamental importance for contemporary research. He received the 1902 Nobel Prize in Literature for being "the greatest living master of the art of historical writing, with special reference to his monumental work, A History of Rome", after having been nominated by 18 members of the Prussian Academy of Sciences. He was also a prominent German politician, as a member of the Prussian and German parliaments. His works on Roman law and on the law of obligations had a significant impact on the German civil code.

Theodor Nöldeke was a German orientalist and scholar. His research interests ranged over Old Testament studies, Semitic languages and Arabic, Persian and Syriac literature. Nöldeke translated several important works of oriental literature and during his lifetime was considered an important orientalist. He wrote numerous studies and contributed articles to the Encyclopædia Britannica.