| Jayabahu I | |
| King of Polonnaruwa | |
| Reign: | 1110–1111 |
| Predecessor: | Vijayabâhu I |
| Successor: | Vikramabâhu I |
| Royal House: | House of Vijayabahu |
| Father: | King Moggallana |
| Mother: | Queen Lokitha |
| Birth Place: | Ruhuna |
| Religion: | Theravada Buddhism |
Jayabâhu I was the brother of Vijayabâhu I. He ruled for just one year, from 1110 to 1111. He was defeated in war by Vikramabâhu I.