Llywarch may refer to:
- Llywarch Hen (6th century), Brythonic prince and poet
- Llywarch ap Hyfaidd (died c. 904), king of Dyfed
- Llywarch ap Llywelyn (fl. 1173–1220), medieval Welsh poet.
- Llywarch Llaety (fl. 1140–1160), Welsh court poet
- Llywarch Reynolds (1843–1916), Welsh solicitor and scholar
This disambiguation page lists articles about people with the same name.
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