Maredudd ap Tewdws (English: Meredith son of Theodosius; died c. 797) was a king of Dyfed in South Wales.
His father was Tewdws son of Rhain ap Cadwgan.
His sons, who both reigned after him, were Rhain and Owain.
[1] His death was recorded in the Annals of Wales.
The entry is undated, but Phillimore's reconstruction places it in AD 797.