She will help raise awareness of the charity, which provides hospice care for people of all ages in their place of choice, and is the only charity providing children’s nursing care in the home.
Ms Cottrell has served as a magistrate for more than 20 years, and was awarded an OBE in 2011 in recognition of her services to the county.
She is also patron of both Visit Kent and Produced in Kent, a Kent Ambassador, and a Liveryman and Freeman of the City of London.
“I am delighted and honoured to be appointed patron of ellenor,” she said.
“I have worked with them for some time and thus have had the chance to see the remarkable work they do. I look forward to being able to add something to this exceptional cause.”
She visited the Gravesend hospice last week and spent time with patients, volunteers and staff.
Chief Executive Claire Cardy said: “Amanda has been a long-term supporter of ellenor and we are delighted and honoured that she has chosen to support our charity as a patron.”