A pub exterior with black facade, branded awnings, outdoor tables, and yellow chairs at O'Neill's Trinity Street Cardiff.
A function room in a pub with patterned carpet, wooden tables, warm lighting, and TVs at O'Neill's Trinity Street Cardiff.
A pub function room with plaid carpet, wooden tables, and booth seating at O'Neill's Trinity Street Cardiff.
A pub function room with long wooden tables, bench seating, TV screens, and exposed bulb lighting at O'Neill's Trinity Street Cardiff.
A function room with round wooden tables, patterned carpet, and wall-mounted TV at O'Neill's Trinity Street Cardiff.
A function room with hanging Edison bulbs, wooden tables, and patterned flooring at O'Neill's Trinity Street Cardiff.
A function room with wooden tables, patterned carpet, string lights, and green walls at O'Neill's Trinity Street Cardiff.
A function room in a pub with exposed brick walls, wooden paneling, and a stocked bar at O'Neill's Trinity Street Cardiff.
A pub function room with dark tiled walls, plaid carpet, wooden tables, and a leather bench at O'Neill's Trinity Street Cardiff.
A function room in a pub with wood tables, mixed seating, and plaid carpet at O'Neill's Trinity Street Cardiff.
An event space in a pub with booth seating, wooden tables, and a wall-mounted TV at O'Neill's Trinity Street Cardiff.
An event space in a pub with wooden tables, plaid carpet, and a large TV at O'Neill's Trinity Street Cardiff.
A bar with chilled Peroni beer bottles in white ice buckets at O'Neill's Trinity Street Cardiff.
A bar with bottles of Moët champagne and two empty wine glasses at O'Neill's Trinity Street Cardiff.
Bar snacks with nachos topped with jalapenos and a glass of draft beer at O'Neill's Trinity Street Cardiff.
A pub bar with a pepperoni pizza in the foreground and baskets of fries and sides at O'Neill's Trinity Street Cardiff.
A pub table with tortilla wraps filled with ham and lettuce alongside tortilla chips at O'Neill's Trinity Street Cardiff.
Bar bites including glazed chicken wings and mini burgers with lettuce at O'Neill's Trinity Street Cardiff.
A pub setting with fried snacks, dipping sauce, and hand-held appetizers at O'Neill's Trinity Street Cardiff.
A bar with a neon sign on herringbone tile and backlit liquor bottles at O'Neill's Trinity Street Cardiff.

O'Neill's Trinity Street Cardiff

Pub

  11 reviews  – 
20-21 Trinity Street, Cardiff, CF10 1BH –
Cardiff Centre
From £5
per person
Up to 40
seats
Up to 100
standing
Venue offers catering
American
cuisine
Parking available
Manager's avatar
Sarah Austin
Supervenue badge #Supervenue
Your Personal Event Manager from Mitchells & Butlers
Response rate: 92%
Response time: Within 2 hours
Message host
Partnered with Tagvenue for 1 year

This manager has been a trusted partner of Tagvenue, consistently recognised by customers for their reliability.

Excellent communication - 4.8/5
91 verified clients rated their communication with the venue manager as 4.8. They appreciated the manager's professionalism and quick response times.
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Spaces for hire at O'Neill's Trinity Street Cardiff

Private Upstairs Room at O'Neill's Trinity Street Cardiff

Private Upstairs Room
Function Room
·
Private space
40 seats
100 standing
The Private Upstairs Room is a Function Room in O'Neill's Trinity Street Cardiff and has a compact, bar-centred layout that creates a private space above the main pub. Design: The room has exposed brick and dark wood panelling, a low coffered ceiling and warm pendant lighting that keep sightlines short and the layout intimate. Features: The room ...
Alcohol licence until 2:00
Alcohol licence extension
PA system / music speakers
Play your own music
from £200 minimum spend
Pricing updated by venue 4 months ago
Enquire now
Downstairs Section at O'Neill's Trinity Street Cardiff

Downstairs Section
Function Room
·
Semi-private area
20 seats
40 standing
The roped-off ground floor bar area holds 30–35 seated guests, or up to 40 standing. The space is split across two sides, with booth seating and additional tables. It's a semi-private area for birthdays, after-work drinks, networking events, and celebrations. The area includes multiple TVs (booth screens and two large wall screens), with an acces...
Alcohol licence until 2:00
Alcohol licence extension
Unavailable: PA system / music speakers
Unavailable: Play your own music
from £5 per person
Pricing updated by venue 4 months ago
Enquire now

Reviews and ratings

4.8
2 new reviews from verified users within the last 6 months
5 recent guests highly rated amenities, location, service quality and catering
Amenities
4.8
Cleanliness
4.2
Location
5.0
Service quality
5.0
Value for money
4.6
Catering
5.0
Communication
5.0

Verified reviews come from Tagvenue users. All reviews are checked by our team to uphold our trust and safety standards.

JB
Julie B.
Verified review
Pub · 50 guests · September 2026 · Private Upstairs Room

City centre venue

The deposit was misleading. I had to claim back money from my friends. I didnt realise the deposit was a bar tab and not returnable until I arrived

3.8
VW
Verity W.
Verified review
Bar · 50 guests · May 2026 · Private Upstairs Room

We had a FANTASTIC evening here. From start to finish everything went smoothly. The Gold buffet package was outstanding, the food was gorgeous. Our bartenders were so so lovely and accomodating, and we were able to run our evening exactly as we wanted. We have since uploaded photos onto our social media, and it looked so amazing that another society messaged to ask where we had it etc as it looked so good! All-in-all would highly recommend this venue, the communication prior was very good, and the whole evening went exactly as hoped.

nothing!

5.0
CD
Christopher D.
Verified review
Pub · 60 guests · September 2025 · Private Upstairs Room

Great size venue for our party and brilliant location. The staff were fantastic, great food and attentive to what we needed

5.0
KC
Katherine C.
Verified review
Event Space · 40 guests · August 2025 · Private Upstairs Room

Everything

Nothing

5.0

Prices and opening hours

Monday
11:00 – 23:00
from £5 per person
Private Upstairs Room
11:00 – 23:00
from £200 min. spend
Downstairs Section
11:00 – 23:00
from £5 per person
Tuesday
11:00 – 23:00
from £5 per person
Private Upstairs Room
11:00 – 23:00
from £200 min. spend
Downstairs Section
11:00 – 23:00
from £5 per person
Wednesday
11:00 – 23:00
from £5 per person
Private Upstairs Room
11:00 – 23:00
from £200 min. spend
Downstairs Section
11:00 – 23:00
from £5 per person
Thursday
11:00 – 0:00
from £5 per person
Private Upstairs Room
11:00 – 23:00
from £200 min. spend
Downstairs Section
11:00 – 0:00
from £5 per person
Friday
9:00 – 0:00
from £5 per person
Private Upstairs Room
9:00 – 0:00
from £200–£500 min. spend
Downstairs Section
9:00 – 0:00
from £5 per person
Saturday
9:00 – 0:00
from £5 per person
Private Upstairs Room
9:00 – 0:00
from £500 min. spend
Downstairs Section
9:00 – 0:00
from £5 per person
Sunday
11:00 – 22:00
from £5 per person
Private Upstairs Room
11:00 – 22:00
from £200 min. spend
Downstairs Section
11:00 – 22:00
from £5 per person
Pricing updated by venue 4 months ago
Pricing rated as accurate by 1 verified user

Best Price guarantee: you will always pay the same price as booking directly with the venue, and we never add hidden or processing fees.

Facilities and catering options

Up to 100
standing
Up to 40
seats
In-house catering
American
cuisine
Parking available
Alcohol provided
Unavailable: External catering allowed
Unavailable: Accommodation available
Unavailable: Promoted / ticketed events
Unavailable: BYO alcohol

About O'Neill's Trinity Street Cardiff

O'Neill's Trinity Street Cardiff is a Trusted Tagvenue Partner, validated by the Tagvenue team with a record of successful bookings on the platform.

O'Neill's Trinity Street is an amazing place, just a stone’s throw from the hustle and bustle of Cardiff’s city centre. Whether you're looking for a space to book more casual drinks, a private room for a party, a meeting room or a corporate function we've got you covered.

Get in touch to discuss your requirements—we’d love to help!

FAQ

No, external catering cannot be brought to the venue.

No, there is no lift to the event space.

No, guests under 18 are not allowed after 20:00.

No, the space is not fully accessible.

The private room includes its own private bar, private toilets, full AV facilities and a range of set-up options.

Cancellations 30 days in advance will receive a full refund.

Cancellations 30 days to 7 days in advance will receive a 50% refund.

Cancellations for events starting within 7 days are non-refundable.

Event date of a confirmed booking can be changed to another date within 3 months from the original date, at no cost.

At O'Neill's Trinity Street Cardiff, the following catering options are available:

  • In-house catering service is available

  • Paid parking facilities are available nearby

Here are some event spends from guests who recently held events at O'Neill's Trinity Street Cardiff:

  • Private Upstairs Room hosting 50 guests: £1790.08

For detailed pricing tailored to your event, please contact the venue.

O'Neill's Trinity Street Cardiff is located at 20-21 Trinity Street, in Cardiff Centre.

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20-21 Trinity Street, Cardiff, CF10 1BH

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