Jillian Louise Calland Duff (called Jill; née Worsley; born 1972) is a British Anglican bishop. Since 2018, she has been the Bishop of Lancaster, a suffragan bishop in the Diocese of Blackburn. Previously, she had been Director of St Mellitus College, North West, an Anglican theological college, from 2013 to 2018. Before ordination, she studied chemistry at university and worked in the oil industry. After ordination in the Church of England, she served in the Diocese of Liverpool in parish ministry, chaplaincy, and church planting.