European cask-conditioned ale, not normally available in the UK, will be on sale at the next JD Wetherspoon beer festival.
The company will be staging beer festivals in all of its 480 pubs from April 26 until April 29 and in its City and central London pubs from April 23 until April 27.
The pubs will be serving five European beers imported from brewers in the Czech Republic, Germany and Eire.
The beers on offer are Germany's Diebels Alt Premium Dark and Fruh Kolsch, Kozel Dark and Herold Bohemian Black Lager from the Czech Republic and the Dublin Brewing Company's Beckett's Dublin Beer from Eire.
As well as the European beers, the pubs will be selling up to 25 different beers from across the UK including Hydes' Down the Hatch, Redruth Cornish Rebellion and Cain's Dr Duncan's Elixir.
Wetherspoon chairman Tim Martin said: "Our pubs will definitely have the best choice of real ales anywhere in the UK.
"As well as enjoying an excellent selection of UK beers, our customers will have the opportunity to sample our choice of foreign beers which have rarely, if ever, been available outside their own country."