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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  • 3.0
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    2 months ago
    Very little respect shown to the Guinness... it wasn't poured properly which was disappointing for an Irish bar. Drink prices were very expensive... double the price of the same drinks compared to the Prince of Wales pub opposite, the tables were sticky and not cleaned, the toilets weren't the best, and the service wasn't particularly good (borderline poor/slow)... so I'm struggling to understand why anyone would frequent or return.
  • 4.0
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    6 months ago
    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!
  • 1.0
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    2 weeks ago
    As an englishman who has been out the uk for 7 years, no wonder I live abroad. I went to this bar 3 times and same every time and only reason I went back as it was the best of the worsed. Door man and customers must have been born in a barn, doors always open and freezing cold. I ate once and was ok. Not sure where the slim ladies were...lol UK has changed for sure.