O'Neill's St. Mary Street Cardiff

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O'Neill's St. Mary Street Cardiff O'Neill's is Cardiff's premier bar providing excellent quality meals with live music

O'Neill's St Mary Street brings Irish hospitality to Cardiff, pouring character alongside pints. This lively pub is the place for late-night buzz, match-day excitement, or hearty bites from morning to night. Guests can drop in for breakfast, linger over lunch, or rally friends for an evening session. Expect crowd-pleasing plates, live sports on screen, spirited drinks deals, and music that keeps the tempo high. From first whistle to last call, it sets the scene for good company and memorable moments.

Happy Halloween from our Awesome Team looking after our Guests tonight 👻💀🎃🔥🔥🔥🔥
31/10/2026

Happy Halloween from our Awesome Team looking after our Guests tonight 👻💀🎃🔥🔥🔥🔥

30/10/2026
30/10/2026

Scary - Oke Friday 💀👻, join us later for the Monster Mash 🕺💃

Looking for the perfect place to celebrate? 🎉At O’Neill’s, the good vibes never stop! Whether you're planning a night ou...
27/10/2026

Looking for the perfect place to celebrate? 🎉
At O’Neill’s, the good vibes never stop!
Whether you're planning a night out with friends
or just want to enjoy an unforgettable atmosphere,
we’ve got you covered!! 🤩

🍻 Great parties every weekend
📺 Live sports on big screens
🎤 Karaoke every Friday
✨ And so much more!

Come and visit us on the weekends and experience the best nights in Cardiff! 😁

📸 Photos by https://www.instagram.com/knot_photographs/

Just over a week to go !!!! Have you got your costume 🎃👻💀
23/10/2026

Just over a week to go !!!! Have you got your costume 🎃👻💀

Pop in for a bite to eat with us today, we have a meal & drink offer from only £9.75, choose from light bites, fish & ch...
23/10/2026

Pop in for a bite to eat with us today, we have a meal & drink offer from only £9.75, choose from light bites, fish & chips to burgers & grills. Available Mon - Fri 12-6

22/10/2026

Alternative Karaoke 🎤🎤🎤🎤🎤 every Thursday 🕺💃🔥🔥🔥

Thursday’s After Dark Alternative Music Karaoke from 7pm, Emo’s / Goths / Rock / Metal this one’s for you. Student disco...
19/10/2026

Thursday’s After Dark Alternative Music Karaoke from 7pm, Emo’s / Goths / Rock / Metal this one’s for you. Student discounts available all night with valid ID Happy hour 4-8pm

Address

85-87 St Mary Street
Cardiff
CF101DW

Opening Hours

Monday 10am - 11pm
Tuesday 10am - 11pm
Wednesday 10am - 1am
Thursday 10am - 1am
Friday 10am - 1am
Saturday 10am - 1am
Sunday 10am - 12am

Telephone

+442920664103

Website

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