| Type: | Bishop |
| Honorific-Prefix: | The Right Reverend |
| William Paul Vachalan | |
| Bishop of South Kerela | |
| Church: | Church of South India |
| Diocese: | South Kerela |
| Term Start: | 1967 |
| Death Date: | 1972 |
| Buried: | M M Church Cemetery |
| Nationality: | Indian |
| Residence: | Trivandrum |
| Children: | Daughter - Prema Frederick |
William Paul Vachalan[1] was a bishop in the Church of South India, the second Bishop of South Kerela.[2]
Vachalan served with the Basel Mission. He was later Principal of the Kerala United Theological Seminary at Trivandrum.