Elizabeth L. Post (May 7, 1920 – April 24, 2010) was an etiquette writer and the granddaughter-in-law of the etiquette writer Emily Post.Post (née Elizabeth Lindley) was born in Englewood, New Jersey, on May 7, 1920, the third child of Allen Ledyard Lindley and Elizabeth Ellsworth Lindley. She was the great-granddaughter of Cyrus Field.Elizabeth Lindley's first husband was Lt. George Eustis Cookman, USN, who was killed in action in 1943.