Thiruvalluvar commonly known as Valluvar, was an Indian poet and philosopher. He is best known as the author of the Tirukkuṟaḷ, a collection of couplets on ethics, political and economic matters, and love. The text is considered an exceptional and widely cherished work of Tamil literature.

Almost no authentic information is available about Valluvar, states Kamil Zvelebil – a scholar of Tamil literature. His life and likely background are variously inferred from his literary works by different biographers. There are unauthentic hagiographic and legendary accounts of Valluvar's life, and all major Indian religions, as well as Christian missionaries of the 19th century, have tried to claim him as secretly inspired (crypto-) or originally belonging to their tradition. Little is known with certainty about his family background, religious affiliation, or birthplace. He is believed to have lived at least in the town of Mylapore (a neighbourhood of the present-day Chennai), and his floruit is dated variously from fourth century BCE to early fifth century CE, based on the traditional accounts and the linguistic analyses of his writings. Kamil Zvelebil infers the Tirukkuṟaḷ and Valluvar are best dated to around 500 CE.

Valluvar has influenced a wide range of scholars down the ages since his time across the ethical, social, political, economical, religious, philosophical, and spiritual spheres. He has long been venerated as a great sage, and his literary works a classic of Tamil culture.

There is negligible authentic information available about Valluvar's life. In fact, neither his actual name nor the original title of his work can be determined with certainty. Tirukkuṟaḷ itself does not name its author. Monsieur Ariel, a French translator of his work in the 19th century, famously said it is "the book without a name by an author without a name". The name Thiruvalluvar (lit. Saint Valluvar) was first mentioned in the later text Tiruvalluva Maalai.

The speculations about Valluvar's life are largely inferred from his work Tirukkuṟaḷ and other Tamil literature that quote him. According to Zvelebil, Valluvar was "probably a learned Jain with eclectic leanings and intimate acquaintance with the early works of Tamil classical period and some knowledge of the Sanskrit legal and didactic texts (subhashita)".

The Shaivite Tamil text Tiruvalluva Maalai contains the earliest known textual reference to the legend of Valluvar, but it remains undated. This text attracted attention in the colonial era because an early 19th-century commentary referred to him as "Valluvan" (Valluvar) whose text presented the "esoteric wisdom of the Vedas to the world". The original text relates the Kural in the context of Sanskrit literature. The commentary includes the gloss that Valluvan was "born in a low caste", but the original text does not. According to Stuart Blackburn, this comment appears to be extra-textual and possibly based on the oral tradition. No other pre-colonial textual sources have been found to support any legends about the life of Valluvar. Starting around the early 19th century, numerous legends on Valluvar in Indian languages and English were published.

Various claims have been made regarding Valluvar's family background and occupation in the colonial era literature, all inferred from selective sections of his text or hagiographies published since the colonial era started in Tamil Nadu. One traditional version claims that he was a Paraiyar weaver. Another theory is that he must have been from the agricultural caste of Vellalars because he extols agriculture in his work. Another version states he was an outcast, born to a Pariayar woman and Brahmin father. Mu Raghava Iyengar speculated that "valluva" in his name is a variation of "vallabha", the designation of a royal officer. S. Vaiyapuri Pillai suggested Valluvar derived his name from "Valluvan" (a Paraiyar caste of royal drummers) and theorized that he was "the chief of the proclaiming boys analogous to a trumpet-major of an army". H. A. Stuart, in his Census Report of 1891, claimed that Valluvans were a priestly class among the Paraiyars and served as priests during Pallava reign, and similarly Robert Caldwell, J. H. A. Tremenheere and Edward Jewitt Robinson, too, claimed that Valluvar was a Paraiyar. Valluvar was likely married to a woman named Vasuki and lived in Mylapore. According to traditional accounts, Valluvar died on the day of Anusham in the Tamil month of Vaikasi.

The poem Kapilar Agaval, purportedly written by Kapilar, describes its author as a brother of Valluvar. It states that they were children of a Pulaya mother named Adi and a Brahmin father named Bhagwan. The poem claims that the couple had seven children, including three sons (Valluvar, Kapilar, and Atikaman) and four sisters (Avvai, Uppai, Uruvai, and Velli). However, this legendary account is spurious. Kamil Zvelebil dates Kapilar Agaval to 15th century CE, based on its language. Various biographies mention the name of Valluvar's wife as Vasuki, but such details are of doubtful authenticity.