Cynog is a Welsh male given name. In Old Welsh, it was pronounced and written as Kynauc, Kennauc, and in other ways.
It may refer to:
Saint Cynog ap Brychan (5th century), Welsh martyred prince Merthyr Cynog, a hamlet in Powys named for the saint Parc Cynog, a wind farm named for the saint Various churches dedicated to the saint () Llangynog, Carmarthenshire, a community named for its church Cynog (bishop) (late 6th century), the second bishop of Meneva (modern St David's) Cynog Dafis (born 1938), Welsh Plaid Cymru politician