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The Thirty-three deities (Sanskrit: trayastriṃśat) is a pantheon of Vedic deities, some of Vedic origin and some developed later. All the Vedic deities are called tri-piṣṭapa, and there are three kinds of them — the Ādityas, the Vasus and the Rudras — beneath whom are the other demigods, like the Maruts and Sādhyas. Tridasha generally includes a set of 31 deities consisting of 12 Ādityas, 11 Rudras, and 8 Vasus, while the identity of the other two deities that fill out the 33 varies.
The 33 are:
- Eight Vasus (deities of material elements) – Dyauṣ "Sky", Pṛthivī "Earth", Vāyu "Wind", Agni "Fire", Nakṣatra "Stars", Varuṇa "Water", Sūrya "Sun", Chandra "Moon"
- Twelve Ādityas (personified deities) – Vishnu, Aryaman, Indra (Śakra), Tvāṣṭṛ, Varuṇa, Bhaga, Savitṛ, Vivasvat, Aṃśa, Mitra, Pūṣan, Dakṣa. This list sometimes varies in particulars.
- Eleven Rudras, consisting of:
Other sources include the two Aśvins (or Nāsatyas), twin solar deities.
- According to Madhavaacarya: ādityā vasavo rudrās tri-vidhā hi surā yataḥ 
- There are eight Vasus, eleven Rudras, twelve Âdityas; and these two, Heaven and Earth, are the (thirty-second and) thirty-third. And there are thirty-three gods, and Pragâpati is the thirty-fourth;--thus he makes him (the sacrificer, or Yagña) to be Pragâpati 2: now that 3 is, for that is immortal, and what is immortal that is. But what is mortal that also is Pragâpati; for Pragâpati is everything: thus he makes him to be Pragâpati, and hence there are these thirty-four utterances, called expiations. Satapatha Brahmana 4:5:7:2 (aṣṭau vasavaḥ | ekādaśa rudrā dvādaśādityā ime eva dyāvāpṛthivī trayastriṃśyau trayastriṃśadvai devāḥ prajāpatiścatustriṃśastadenam prajāpatiṃ karotyetadvā astyetaddhyamṛtaṃ yaddhyamṛtaṃ taddhyastyetadu tadyanmartyaṃ sa eṣa prajāpatiḥ sarvaṃ vai prajāpatistadenam prajāpatiṃ karoti tasmādetāścatustriṃśadvyāhṛtayo bhavanti prāyaścittayo nāma)