Lleifior is the name of a fictional farm in two Welsh language novels by Islwyn Ffowc Elis.
The novels are both set in the 1950s: Cysgod y Cryman ("Shadow of the Sickle") and Yn ôl i Leifior ("Back to Lleifior").
Cysgod y Cryman, first published in 1953, follows the Vaughan family dynasty in post war rural Powys.
It has also been issued in a Welsh learners' edition, published in 1987 by Gwasg Gomer and three times reprinted.
The first stage production was in 2007 by Theatr Genedlaethol Cymru adapted by Sion Eirian.