| Country: | England |
| Static Image Name: | Allerby - geograph.org.uk - 1498817.jpg |
| Static Image Caption: | Houses at Allerby |
| Coordinates: | 54.73°N -3.43°W |
| Official Name: | Allerby |
| Civil Parish: | Oughterside and Allerby |
| Unitary England: | Cumberland |
| Lieutenancy England: | Cumbria |
| Region: | North West England |
| Constituency Westminster: | Workington |
| Post Town: | WIGTON |
| Postcode District: | CA7 |
| Postcode Area: | CA |
| Dial Code: | 01900 |
| Os Grid Reference: | NY0839 |
| Pushpin Map: | United Kingdom Allerdale |
Allerby is a hamlet in the civil parish of Oughterside and Allerby, Cumbria, England.
Allerby was originally called " 'Ailward's', that is 'Æðelward's, Crosby', afterwards reduced to 'Ailward's bȳ'."[1] So, "the village or hamlet of Ailward". (English, Old (ca.450-1100);: Bȳ is Old English from the Old Norse Norse, Old: býr, meaning 'village' or 'hamlet'.)