Dillwyn may refer to the following: Places Dillwyn, Kansas Dillwyn, Virginia People with the surname Amy Dillwyn (1845-1935), Welsh novelist Lewis Llewelyn Dillwyn (1814-1892), Welsh industrialist and Liberal politician Lewis Weston Dillwyn (1778-1855), British porcelain manufacturer, naturalist and Member of Parliament People with the name Dillwyn Parrish (1894—1941), American writer, illustrator, and painter. Dilly Knox born Alfred Dillwyn Knox (1884–1943) British codebreaker. John Dillwyn Llewelyn (1810–1882) Welsh botanist and pioneering photographer.