The Stromata (Greek: Στρώματα), a mistake for Stromateis (Στρωματεῖς, "Patchwork," i.e., Miscellanies), attributed to Clement of Alexandria (c. 150 – c. 215), is the third of a trilogy of works regarding the Christian life. The oldest extant manuscripts date to the eleventh century. The work is titled Stromateis ("patchwork”) because it deals with such a variety of matters. It goes further than its two predecessors and aims at the perfection of the Christian life by initiation into complete knowledge. It attempts, on the basis of Scripture and tradition, to give such an account of the Christian faith as shall answer all the demands of learned men, and conduct the student into the innermost realities of his belief.

The contents of the Stromateis, as its title suggests, are miscellaneous. Its place in the trilogy is disputed – Clement initially intended to write the Didascalus, a work which would complement the practical guidance of the Paedagogus with a more intellectual schooling in theology. The Stromata is less systematic and ordered than Clement's other works, and it has been theorized by André Méhat that it was intended for a limited, esoteric readership.

The sole authority for the Stromateis is preserved at the Laurentian Library in Florence. How it came to Florence is unknown. The editio princeps was published by Piero Vettori in 1550.

In the 19th century, Percy Mordaunt Barnard and Otto Stählin posited that this manuscript was copied out in the 910s for Arethas of Caesarea, the remainder of whose extant library is held by the Bibliothèque nationale de France. Their theory is generally accepted today. As with the library of Arethas held at Paris, the Laurentian manuscript contains numerous misspellings, omitted words and sentences and even marginalia integrated into the text. However, Frederic G. Kenyon argued that this is not the fault of the copyist, but that an ancestral manuscript had caused the damage, perhaps even a papyrus.

The first book written c. 198 AD starts on the topic of Greek philosophy. Consistent with his other writing, Clement affirms that philosophy had a propaedeutic role for the Greek, similar to the function of the law for the Jews. He then embarks on a discussion of the origins of Greek culture and technology, arguing that most of the important figures in the Greek world were foreigners, and (erroneously) that Jewish culture was the most significant influence on Greece. In an attempt to demonstrate the primacy of Moses, Clement gives an extended chronology of the world, wherein he dates the birth of Christ to 25 April or May, 4-2 B.C., and the creation of the world to 5592 B.C. The book ends with a discussion on the origin of languages and the possibility of a Jewish influence on Plato.

The second book written c. 199 AD-c.201 AD is largely devoted to the respective roles of faith and philosophical argument. Clement contends that while both are important, the fear of God is foremost, because through faith one receives divine wisdom. To Clement, scripture is an innately true primitive philosophy which is complemented by human reason through the Logos. Faith is voluntary, and the decision to believe is a crucial fundamental step in becoming closer to God. It is never irrational, as it is founded on the knowledge of the truth of the Logos, but all knowledge proceeds from faith, as first principles are unprovable outside a systematic structure.

The third book written c. 199 AD-c.201 AD covers asceticism. He discusses marriage, which is treated similarly in the Paedagogus. Clement rejects the Gnostic opposition to marriage, arguing that only men who are uninterested in women should remain celibate, and that sex is a positive good if performed within marriage for the purposes of procreation. However it has not always been so: the Fall occurred because Adam and Eve succumbed to their desire for each other, and copulated before the allotted time. He argues against the idea that Christians should reject their family for an ascetic life, which stems from Luke 14:25–27, contending that Jesus would not have contradicted the precept to "Honour thy Father and thy Mother" (Exodus 20:12), one of the Ten Commandments. Clement concludes that asceticism will only be rewarded if the motivation is Christian in nature, and thus the asceticism of non-Christians such as the gymnosophists is pointless.

Clement begins the fourth book written c. 199 AD-c.201 AD with a belated explanation of the disorganized nature of the work, and gives a brief description of his aims for the remaining three or four books. The fourth book focuses on martyrdom. While all good Christians should be unafraid of death, Clement condemns those who actively seek out a martyr's death, arguing that they do not have sufficient respect for God's gift of life. He is ambivalent whether any believing Christian can become a martyr by virtue of the manner of their death, or whether martyrdom is reserved for those who have lived exceptional lives. Marcionites cannot become martyrs, because they do not believe in the divinity of God the Father – their sufferings are in vain. There is then a digression to the subject of theological epistemology. According to Clement, there is no way of empirically testing the existence of God the Father, because the Logos has revelatory, not analysable meaning, although Christ was an object of the senses. God had no beginning, and is the universal first principle.