The Vedda (Sinhala: වැද්දා [ˈvædːaː]; Tamil: வேடர் (Vēḍar)), or Wanniyalaeto, are a minority indigenous group of people in Sri Lanka who, among other sub-communities such as Coast Veddas, Anuradhapura Veddas and Bintenne Veddas, are accorded indigenous status. The Vedda minority in Sri Lanka may become completely assimilated. Most speak Sinhala instead of their indigenous languages, which are nearing extinction. It has been hypothesized that the Vedda were probably the earliest inhabitants of Sri Lanka and have lived on the island since before the arrival of other groups from the Indian mainland.

The Ratnapura District, which is part of the Sabaragamuwa Province, is known to have been inhabited by the Veddas in the distant past. This has been shown by scholars like Nandadeva Wijesekera. The very name Sabaragamuwa is believed to have meant the village of the Sabaras or "forest barbarians". Place-names such as Vedda-gala (Vedda Rock), Vedda-ela (Vedda Canal) and Vedi-Kanda (Vedda Mountain) in the Ratnapura District also bear testimony to this. As Wijesekera observes, a strong Vedda element is discernible in the population of Vedda-gala and its environs.

Ethnonyms of Vedda include Vadda, Veddah, Veddha and Vaddo. "Vedda" is a word that stems from the Tamil word Vēdan meaning "hunter", or from Sanskrit vyādha ("hunter") or veddhṛ ("the one who pierces").

Groups ancestral to the modern Veddas were probably the earliest inhabitants of Sri Lanka. Their arrival is dated tentatively to about 40,000–35,000 years ago. They show a relationship with other South Asian and Sri Lankan populations, but are genetically distinguishable from the other peoples of Sri Lanka, and show a high degree of intra-group diversity. This is consistent with a long history of existing as small subgroups undergoing significant genetic drift.

In one study on maternal (mitochondrial DNA) haplogroups in Sri Lankan populations (the Vedda, Sri Lankan Tamils, Indian Tamils of Sri Lanka, and Sinhalese), the Vedda were found to carry predominantly haplogroups U and R and to carry maternal haplogroup M at about 17%, unlike the Indian Tamils of Sri Lanka and many mainland Indian tribal groups, among which haplogroup M is predominant. The Vedda people and Low-country Sinhalese showed frequencies of haplogroup R at 45.33 and 25%, respectively. The Vedda were found to be distinct but closer to Sinhalese than to other South Asian groups. It was determined in the study to be likely that the branches of haplogroups R and U "found to be particularly prevalent in the Vedda, were derived from ancestors on the Indian subcontinent."

Another study on maternal haplogroups in Sri Lankan groups (also the Vedda, Sri Lankan Tamil, and Sinhalese) found similar results, with the Vedda belonging predominantly to the mitochondrial haplogroup N (which "exists in almost all European, Oceanian, and many Asian and Amerindian populations.") and its subgroups U and R (with those comprising about two thirds of their maternal lineages), differing from other South Asian groups (such as the Sri Lankan Tamil, Sinhalese, and several Indian Tribal groups) among whom haplogroup M is predominant. The study also found that "South Asian (Indian) haplogroups were predominant" in the three Sri Lankan groups (including the Vedda) but that the Sinhalese, Sri Lankan Tamil, and Vedda populations also "had a considerable presence of West Eurasian haplogroups." One phylogenetic study on mitochondrial DNA hypervariable segments HVI and part of HVII showed the Vedda to be "genetically distinct from other major ethnic groups (Sinhalese, Sri Lankan Tamils and Indian Tamils) in Sri Lanka." Another study on alpha-2-HS-glycoprotein allele frequency showed the Veddas and Sinhalese to be more biologically related to each other than to most other ethnic groups in Asia.

A 2024 genetics study using high-resolution autosomal and Mitochondrial DNA analysis found that the Veddas were Genetically More closer to the Pallar caste of India and Srilanka, Santhal, Juang, Irula and Paniya tribes .than to the Sinhalese and Sri Lankan Tamils. The study concluded that the Veddas were "a genetically drifted group with limited gene flow from neighbouring Sinhalese and Sri Lankan Tamil populations" and that the maternal Haplogroup M mediated their initial settlement of the island. Other studies have shown the Vedda share genetic components with the Sinhalese and Sri Lankan Tamils as well as genetic affinity with the Irula, Kota and Mulla Kuruma of India, the Semai and Senoi of Malaysia and tribal groups of Upper Myanmar. A 2025 study revealed significant allele sharing between the Veddas and East Asian-related populations, including Austroasiatic- and Tibeto-Burman-speaking populations. It was concluded that the East Asian genetic affinity can be partially explained due to high levels of Basal Asian AASI ancestry, which is genetically related to ancestral East Asians found in the Veddas.

The original language of the Veddas is the Vedda language, which today is used primarily by the interior Veddas of Dambana. Communities such as Coast Veddas and Anuradhapura Veddas, who do not identify themselves strictly as Veddas, also use Vedda language for communication during hunting and or for religious chants.^{[citation needed]} When a systematic field study was conducted in 1959, it was determined that the language was confined to the older generation of Veddas from Dambana. In the 1990s, self-identifying Veddas knew few words and phrases in the Vedda language, but there were individuals who knew the language comprehensively. Initially, there was considerable debate among linguists as to whether Vedda is a dialect of Sinhala or an independent language. Later studies indicate that it diverged from its parent stock in the 10th century and became a Creole and a stable independent language by the 13th century, under the influence of Sinhala.