''Tractatus'' is Latin for "

treatise A treatise is a Formality, formal and systematic written discourse on some subject concerned with investigating or exposing the main principles of the subject and its conclusions."mwod:treatise, Treatise." Merriam-Webster Online Dictionary. Acc ...

". It may refer to: * '' Tractatus de amore'' by Andreas Capellanus * '' Tractatus Astrologico Magicus'', also known as the'' Aldaraia'' and the ''Book of Soyga'', a 16th-century Latin treatise on magic * ''

Tractatus coislinianus ''Tractatus coislinianus'' is an ancient Greek manuscript outlining a theory of comedy in the tradition of Aristotle's ''Poetics''. Dramatic theory The ''Tractatus'' states that comedy invokes laughter and pleasure, thus purging those emotions (c ...

'', an ancient manuscript on comedy in the tradition of Aristotle *'' Tractatus Eboracenses'' (Tractates of York), dealing with the relationship between kings and the Catholic Church, c. 1100 *

Tractatus of Glanvill The (''Treatise on the Laws and Customs of the Kingdom of England''), often called ''Glanvill'', is the earliest treatise on English law. Attributed to Ranulf de Glanvill (died 1190) and dated 1187–1189, it was revolutionary in its systemati ...

, the ''Tractatus de legibus et consuetudinibus regni Angliae'' (Treatise on the laws and customs of the Kingdom of England), the book of authority on English common law, written c. 1188 and attributed to Ranulf de Glanvill * ''

Tractatus Logico-Philosophicus The ''Tractatus Logico-Philosophicus'' (widely abbreviated and Citation, cited as TLP) is the only book-length philosophical work by the Austrian philosopher Ludwig Wittgenstein that was published during his lifetime. The project had a broad goal ...

'', a philosophical work by Ludwig Wittgenstein * '' Tractatus de Purgatorio Sancti Patricii'' (Treatise on Saint Patrick's Purgatory), a Latin text of c. 1180–84 *'' Tractatus de Sphaera'', or ''De sphaera mundi'', the basic elements of astronomy written by Johannes de Sacrobosco c. 1230 * '' Tractatus de superstitionibus (disambiguation)'', a title shared by two medieval tractates on superstition

By Baruch Spinoza

* '' Tractatus de Intellectus Emendatione'' (On The Improvement Of The Understanding), an unfinished work by Baruch Spinoza * ''

Tractatus Theologico-Politicus The ''Tractatus Theologico-Politicus'' (''TTP'') or ''Theologico-Political Treatise'', is a 1670 work of philosophy written in Latin by the Dutch philosopher Benedictus Spinoza (1632–1677). The book was one of the most important and contr ...

'', a philosophical work by Spinoza * '' Tractatus Politicus''

By Baruch Spinoza

See also