| Country: | Scotland |
| Official Name: | Southdean |
| Scots Name: | Soothdean |
| Static Image Name: | The road leading down to Southdean Farm - geograph.org.uk - 3071486.jpg |
| Static Image Caption: | A6088 road through Southdean |
| Language: | English |
| Language1: | Southern Scots |
| Map Type: | Scotland |
| Coordinates: | 55.3761°N -2.5835°W |
| Os Grid Reference: | NT631092 |
| Unitary Scotland: | Scottish Borders |
| Lieutenancy Scotland: | Roxburgh, Ettrick and Lauderdale |
| Constituency Westminster: | Berwickshire, Roxburgh and Selkirk |
| Constituency Scottish Parliament: | Ettrick, Roxburgh and Berwickshire |
| Post Town: | HAWICK |
| Postcode District: | TD9 |
| Postcode Area: | TD |
| Dial Code: | 01450 |
Southdean is a hamlet in the Scottish Borders area of Scotland, on the A6088, by the Jed Water and in the Wauchope Forest area. Other settlements nearby include Abbotrule, Bedrule, Bonchester Bridge, Denholm, Hallrule, Hobkirk and the Swinnie Forest.
Ruins which can be seen nearby include the remains of Southdean Old Parish Church, the remains of Dykeraw Tower, and the remains of Slack's Tower.
James Telfer (1802 - 1862) was born in Southdean, and wrote ballads about farming life, typically with a zoological slant.