Merrifield Children's Unit (also known as Merryfield or colloquially as Merrifields) was a residential children's and adolescents' psychiatric institution in the grounds of Tone Vale Hospital (an adult mental hospital) approximately 3 km (1.9 miles) north west of Norton Fitzwarren, near Taunton, Somerset, England, in what is now the village Cotford St Luke.

[3] The Unit served the whole of South West England, and for much of its existence its management was under the control of Dr Bethell and nursing officer Donald Mackey.

[7] Of the Merrifield patients, one observer notes, "Some of the children, although highly disturbed, were extremely well read and educated.

[9] Merrifield is succeeded by the Orchard Lodge Young People's Unit located in Cotford St Luke.

[10] In her memoir, The Light in My Mind,[11] Joyce Passmore writes of being admitted to Merrifield in 1957 at the age of 13 suffering with epilepsy, prior to being transferred to the main adult hospital.