Frederick William Pearce Jago (21 December 1817[1] – 1 February 1911) was a Cornish doctor and scholar best known for his work The Ancient Language and the Dialect of Cornwall, originally published 1882 by Netherton and Worth of Truro.
He also published a Cornish dictionary in 1887.
He was born in Bodmin to William Jago and Anne Pearce and was baptised Wesleyan Methodist.
He practiced medicine in Plymouth for many decades.
He retired to St Germans, where he died, aged 93.