| Siward | |
| Religion: | Catholic |
| Bishop of Rochester | |
| Appointed: | 1058 |
| Ended: | 1075 |
| Predecessor: | Godwine II |
| Successor: | Arnost |
| Consecration: | 1058 |
| Other Post: | Abbot of Chertsey |
| Death Date: | 1075 |
Siward (or Sigweard) was a medieval Bishop of Rochester.
Siward was abbot of Chertsey Abbey, a Benedictine abbey in Surrey before he was selected for the see of Rochester.[1] He was consecrated in 1058. He died in 1075.[2] His death was commemorated on 30 October, so he probably died on that date in 1075.[1] After the appointment of Lanfranc as Archbishop of Canterbury, the new archbishop found only four canons at Rochester under Siward's authority.[3]