Hiraethog

Hiraethog may refer to:


 * Gruffudd Hiraethog (died 1564), Welsh language poet
 * Hiraethog Rural District, rural district in Denbighshire, Wales, from 1935 to 1974
 * Mynydd Hiraethog, upland region in Conwy and Denbighshire in north-east Wales
 * William Rees (Gwilym Hiraethog) (1802–1883), Welsh poet and author