Sanskrit prosody or Chandas (छंद) refers to one of the six Vedangas, or limbs of Vedic studies. It is the study of poetic metres and verse in Sanskrit. This field of study was central to the composition of the Vedas, the scriptural canons of Hinduism; in fact, so central that some later Hindu and Buddhist texts refer to the Vedas as Chandas.

The Chandas, as developed by the Vedic schools, were organized around seven major metres, each with its own rhythm, movements and aesthetics. Sanskrit metres include those based on a fixed number of syllables per verse, and those based on a fixed number of morae per verse.

Extant ancient manuals on Chandas include Pingala's Chandah Sutra, while an example of a medieval Sanskrit prosody manual is Kedara Bhatta's Vrittaratnakara. The most exhaustive compilations of Sanskrit prosody describe over 600 metres. This is a substantially larger repertoire than in any other metrical tradition.

The term Chandas (Sanskrit: छन्दः/छन्दस् chandaḥ/chandas (singular)) means "pleasing, alluring, lovely, delightful or charming", and is based on the root chad which means "esteemed to please, to seem good, feel pleasant and/or something that nourishes, gratifies or is celebrated". The term also refers to "any metrical part of the Vedas or other composition".

The hymns of Rigveda include the names of metres, which implies that the discipline of Chandas (Sanskrit prosody) emerged in the 2nd-millennium BCE. The Brahmanas layer of Vedic literature, composed between 900 BCE and 700 BCE, contains a complete expression of the Chandas. Panini's treatise on Sanskrit grammar distinguishes Chandas as the verses that compose the Vedas, from Bhāṣā (Sanskrit: भाषा), the language spoken by people for everyday communication.

Vedic Sanskrit texts employ fifteen metres. Seven are common, and the most frequent three are 8-, 11- and 12-syllable lines. Post-Vedic texts, such as the epics as well as other classical literature of Hinduism, deploy both linear and non-linear metres, many of which are based on syllables and others based on repeating numbers of morae (matra per foot). About 150 treatises on Sanskrit prosody from the classical era are known, in which some 850 metres were defined and studied by the ancient and medieval Hindu scholars.

The ancient Chandahsutra of Pingala, also called Pingala Sutras, is the oldest Sanskrit prosody text that has survived into the modern age, and it is dated to between 600 and 200 BCE. Like all Sutras, the Pingala text is distilled information in the form of aphorisms, and these were widely commented on through the bhashya tradition of Hinduism. Of the various commentaries, those widely studied are the three 6th century texts - Jayadevacchandas, Janashrayi-Chhandovichiti and Ratnamanjusha, the 10th century commentary by Karnataka prosody scholar Halayudha, who also authored the grammatical Shastrakavya and Kavirahasya (literally, The Poet's Secret). Other important historical commentaries include those by the 11th-century Yadavaprakasha and 12th-century Bhaskaracharya, as well as Jayakriti's Chandonushasana, and Chandomanjari by Gangadasa.

There is no word without meter,
nor is there any meter without words.