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Karainagar காரைநகர் කාරෛනගර්  | 
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| Town | |
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 A beachside view 
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| Coordinates: 9°44′0″N 79°52′0″E / 9.73333°N 79.86667°E | |
| Country | Sri Lanka | 
| Province | Northern | 
| District | Jaffna | 
| DS Division | Karainagar | 
Karainagar (Tamil: காரை நகர்) (pronounced Kaarai-Nagar) is located 20 km from Jaffna, Sri Lanka, on the Karaitivu (Island). In Tamil, means a place with abundant Kaarai trees.
Karainagar island is about 10-square-mile (26 km2) area and the registered voters 20,000 voted in 1977 national election. The current population stands at 11,000. 30% of this land can be use for paddy cultivation.
Coordinates: 9°44′N 79°52′E / 9.733°N 79.867°E