The brand, which is about to open its eighth restaurant in Cambridge, has chosen the city of Cardiff to make its Welsh debut.
The new restaurant is expected to open on Wharton Street in March 2027.
The Beefy Boys was founded in 2011 by childhood friends Anthony ‘Murf’ Murphy, Daniel Mayo-Evans, Christian Williams and Lee Symonds.
As well as the forthcoming Cambridge restaurant it operates sites in Hereford, Shrewsbury, Cheltenham, Bath, Oxford, Nottingham and Exeter.
The Beefy Boys also runs two food trucks serving events across the UK.