Susan Elizabeth Miller, Baroness Miller of Chilthorne Domer (born 1 January 1954) is a Liberal Democrat member of the House of Lords.

She married firstly John Miller and secondly Humphrey Temperley, both of whom were active in political life as Liberal Democrats.

She served as a councillor at parish, district and county levels from 1987 to 2005, leading South Somerset District Council and as a member of Somerset County Council.

She was made a Life Peer as Baroness Miller of Chilthorne Domer, of Chilthorne Domer in the County of Somerset on 28 July 1998.

She now chairs the All Party Groups on Agroecology and Food and Health.