The Duffield Memorial is a gravesite monument located in the churchyard of the Church of St Mary in Great Baddow, Essex, England. Designed by Herbert Maryon and installed in 1912, it originally commemorated Marianne Duffield and William Ward Duffield, who died in 1910 and 1912 respectively. A second plaque was added to commemorate their son, William Bartleet Duffield, who died in 1918.
The memorial covers the grave, and comprises edging and a vertical cross. It is designed in the Art Nouveau style and is made of riveted sections of copper alloy sheet metal. The edging follows the rectangular perimeter of the plot, and features short pillars at each corner. The cross is a Celtic wheel cross decorated in relief with leaflike motifs. A curved shaft connects it to the foot, which, like the four-sided base upon which it is mounted, has curved and splayed sides. The plaques commemorating the Duffields are riveted to the base; a medallion was once riveted to the centre of the cross, but is now lost.
Newspapers at the time termed the memorial "very fine" and "quite unique" for the area, and in 2022 it was designated a Grade II listed building. The list entry terms the memorial "an unusual example" of both "churchyard memorial design" and "Art Nouveau design in metal work" and describes it as "well detailed and combined with a conventional form of churchyard memorial, a Celtic wheeled cross".