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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  • 4.0
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    • 5
    in the last week
    nice food, was quiet when we went there which is unusual is lovely supervisor shame about the first guy that served us didn’t get his name, looked very unhappy in his job! work in customer service myself so know how first hand impressions count 😊 thanks lewis, for rectifying poor service!
  • 4.0
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    • 5
    3 months ago
    Loud and proud. Good beer selection. Not my bag but great for those who like loud music in the room.
  • 5.0
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    • 5
    a month ago
    Had the mac and cheese. Worth the extra toppings. However, was Small portion considering it was a additional topping. Food came in good time. it was very busy but the guy who served was run off his feet and maintained good service. This guy deserves a pay rise.