The 45th parallel south is a circle of latitude that is 45 degrees south of the Earth's equatorial plane.

Highway sign marking the 45th parallel in New Zealand.

Unlike its northern counterpart it passes mostly over open ocean. It crosses the Atlantic Ocean, the Indian Ocean, Australasia, the Pacific Ocean and South America.

At this latitude the sun is visible for 15 hours, 37 minutes during the December solstice and 8 hours, 46 minutes during the June solstice.

Around the world

Starting at the Prime Meridian and heading eastwards, the parallel 45 south passes through:

! scope="col" width="125" | Co-ordinates ! scope="col" | Country, territory or sea ! scope="col" | Notes |- | style="background:#b0e0e6;" | ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean | style="background:#b0e0e6;" | |- | style="background:#b0e0e6;" | ! scope="row" style="background:#b0e0e6;" | Indian Ocean | style="background:#b0e0e6;" | |- | style="background:#b0e0e6;" | ! scope="row" style="background:#b0e0e6;" | Pacific Ocean | style="background:#b0e0e6;" | Tasman Sea |- | ! scope="row" | | South Island, passing just north of the towns of Oamaru and Queenstown |- | style="background:#b0e0e6;" | ! scope="row" style="background:#b0e0e6;" | Pacific Ocean | style="background:#b0e0e6;" | Passing just south of Guamblin Island, |-valign="top" | ! scope="row" | | Islands in the Chonos Archipelago including James Island and Melchor Island, and the mainland |- | ! scope="row" | | |- | style="background:#b0e0e6;" | ! scope="row" style="background:#b0e0e6;" | Atlantic Ocean | style="background:#b0e0e6;" | |- |}

See also

• 44th parallel south
• 46th parallel south

fa: fr:45e parall le sud mk:45- ja: 45 pt:Paralelo 45 S uk:45-