The 20th parallel south is a circle of latitude that is 20 degrees south of the Earth's equatorial plane. It crosses the Atlantic Ocean, Africa, the Indian Ocean, Australasia, the Pacific Ocean and South America.
Starting at the Prime Meridian and heading eastwards, the parallel 20° south passes through:
| Co-ordinates | Country, territory or ocean | Notes | |
|---|---|---|---|
| Atlantic Ocean | |||
| Kunene, Otjozondjupa | |||
| Ghanzi, Central | |||
| Indian Ocean | Mozambique Channel | ||
| Indian Ocean | |||
| Indian Ocean | |||
| Western Australia | |||
| Indian Ocean | |||
| Western Australia Northern Territory Queensland | |||
| Pacific Ocean | Coral Sea | ||
| Queensland – Gloucester Island | |||
| Pacific Ocean | Coral Sea Passing south of Marion Reef in 's Coral Sea Islands Territory Passing just south of the Ilots du Mouillage, Passing just north of Île Baaba, Passing between the islands of Tanna and Anatom, | ||
| Passing between the islands of Vatoa and Ono-i-Lau, Passing through the Ha'apai island group, | |||
| Island of Atiu | |||
| Pacific Ocean | Passing between the atolls of Hereheretue and Anuanuraro, Passing between the atolls of Ahunui and Vanavana, | ||
| Mato Grosso do Sul São Paulo Minas Gerais – passing through Belo Horizonte Espírito Santo | |||
| Atlantic Ocean |