Susan Elizabeth Birtwistle, Lady Eyre, (born 9 December 1945) is a producer and writer of television drama. Birtwistle has won awards for several of her productions, including Hotel du Lac, Pride and Prejudice and Emma, and was one of the nominees for the 2008 BAFTA Awards for her production of Cranford.
She was born in Northwich, Cheshire, England, and attended Northwich County Grammar School for Girls (now The County High School, Leftwich). She studied drama and English at Coventry College of Education (became part of the University of Warwick).
She is known for producing well-known costume dramas.