Marjory Allen, Baroness Allen of Hurtwood (née Gill; 10 May 1897 – 11 April 1976), known to her friends as Joan, was an English landscape architect and promoter of child welfare. Marjory Gill was born in Bexleyheath, Kent. She was a cousin of Eric Gill and sister of Colin Gill. She was educated at Bedales School and University College, Reading, where she took a diploma course in horticulture. In 1921 she married Clifford Allen, a leading member of the Independent Labour Party who had been imprisoned as a conscientious objector in World War I. Marjory Allen worked as a landscape architect throughout the 1920s and 1930s and was elected the first fellow of the Institute of Landscape Architects in 1930.