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Images in the eight stamps feature Beowulf and Grendel, Blodeuwedd, the Loch Ness Monster, Cornish piskies, Fionn mac Cumhaill, Black Shuck, a grindylow and a selkie.
The stamps were illustrated by London-based artist Adam Simpson.
David Gold, director of external affairs and policy at Royal Mail, said: “For some parts of the UK, local myths and legends are as much a part of their identity as the local landmarks and architecture.
“These beautifully illustrated stamps celebrate a fascinating aspect of British culture and custom.”
The stamps can be pre-ordered from today and go on sale on March 27.
