John Lancaster may refer to:
John de Lancaster (MP), Member of Parliament (MP) for Lancashire in 1316 John Lancaster (died 1424), MP for Suffolk and Norfolk John Lancaster (died 1434), MP for Cumberland and Westmorland John Lancaster (bishop) (died 1619), 17th-century Anglican Bishop of Waterford and Lismore in Ireland John Lancaster (MP) (1816–1884), MP for Wigan John Lancaster (writer) (born 1946), British poet and writer John Lancaster (Royal Navy officer) (1903–1992)
See also Jon Lancaster (born 1988), racing driver Jack Lancaster, composer