Enjoy Breakfast and Bottomless Brunch at O'Neill's St Mary Street, an Irish-themed pub specialising in Irish music, food, and drinks. Experience a warm and friendly atmosphere while enjoying their range of great Irish beers, including their exclusive Smithwick's Red Ale.

Breakfast at O'Neill's is chocked full of traditional Irish dishes and ingredients, with their Irish pork and leek sausages taking centre stage on most menu items. Enjoy three different sizes of Traditional Irish breakfast, each with fresh, free-range ingredients from Ireland. Fancy something a little smaller? No problem. O'Neill's also offer their "No-Brainer Breakfast Baps", featuring hearty Irish Breakfast sandwiches, as well as their range of Breakfast oats and porridge.

Bottomless Brunch, or Bottomless Lunch as O'Neill's call it, is a unique yet delicious experience at the Irish Pub chain. Diners will be given a range of drinks to choose from, accompanied by a pizza of their choice.

O'Neill's St Mary Street is located right in the centre of Cardiff, just beside the Principality Stadium, and a two minute walk from Cardiff Central. 

Expand Description

Bottomless Brunch:

Thursday-Sunday: 12PM-3:30PM

  • Bottomless Drinks
  • Breakfast
  • Brunch
  • Groups
  • Private Dining
  • Vegan options
  • Accepts Credit Cards
  • Disabled Access
  • Online Booking
85-87 St Mary Street, Cardiff, CF10 1DW
Overall rating
4.3
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  • 5.0
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    2 months ago
    A fantastic venue with a beautifully decorated interior that creates a warm and lively atmosphere. The staff are genuinely friendly and welcoming, which made the experience even better. We caught the drag show and had an absolute blast — full of energy, humour, and great performances. Whether you’re popping in for a drink or staying for the entertainment, O’Neill’s on St Mary Street delivers a great night out. Highly recommend!
  • 4.0
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    4 months ago
    A decent place overall. The meat pie was excellent — tasty and well-prepared. The salad, on the other hand, wasn’t as good and felt a bit underwhelming. The wait for the food was quite long, which made us a bit anxious. It would be nice if things moved faster. Still, the atmosphere was pleasant and made the visit more enjoyable. Dog friendly.
  • 5.0
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    a month ago
    Spent the afternoon here before the Stereophonics gig. The DJ was on point and created a fabulous, happy atmosphere. Also love the floating shots service. Although busy the bar staff were quick to fulfil the orders and keep the pints flowing. Can’t recommend enough for a pre gig drink or five!!