John Lancaster was a seventeenth century Anglican Bishop of Waterford and Lismore in Ireland.
A Chaplain to James I,[2] to supplement his income he held several livings, was a prebendary of four other dioceses and Treasurer of Lismore.
The younger John married Elizabeth Harris, the favourite daughter of Sir Edward Harris, MP for Clonakilty and Chief Justice of Munster and his first wife Elizabeth Fowelll.
Elizabeth died in childbirth in November 1624, greatly to the grief of her father, who erected a memorial to her at Kinsalebeg Church, Ferrypoint, County Waterford.
The younger John spent many years engaged in litigation with his mother's relatives over what he claimed was his rightful share of the Harris inheritance.