Metheglin wani nau'in abin sha ne na giyar zuma wanda aka haɗe da kayan kamshi, ganye, da sauran abubuwan dandano. Kalmar "metheglin" ta fito ne daga kalmar Welsh "meddyglyn", wanda ke nufin "maganin barasa". Abin sha ne na gargajiya a Wales da sauran sassan Burtaniya, kuma galibi ana danganta shi da amfanin kiwon lafiya saboda amfani da zuma da kayan lambu. Ana iya yin Metheglin da nau'o'in sinadarai daban-daban, ciki har da kirfa, cloves, ginger, nutmeg, lemo, da orange, da sauransu.