London remains one of the world’s most dynamic business hubs, attracting global conferences, exhibitions, and corporate events year-round. For event organisers looking to host large-scale gatherings of 1,000 or more delegates, the capital offers an impressive selection of conference venues that blend capacity with cutting-edge technology, accessibility, and prestige. Below, we explore ten top venues in London that can comfortably accommodate big crowds without compromising on quality or experience.
1. ExCeL London
Capacity: Up to 68,000
Location: Royal Victoria Dock, E16
A titan of the UK’s conference and exhibition scene, ExCeL London offers flexible event spaces including ICC London ExCeL, a dedicated conference centre within the complex. It’s ideal for large-scale conferences, conventions, and trade shows, with exceptional transport links and onsite hotels.
2. The O2 – InterContinental London – The O2
Capacity: Up to 3,000 (Arora Ballroom)
Location: Greenwich Peninsula, SE10
Adjacent to the iconic O2 Arena, this luxury hotel and conference centre features the UK’s largest pillar-free ballroom. With river views, excellent transport links, and five-star service, it’s a compelling choice for large corporate events and awards evenings.
3. QEII Centre
Capacity: Up to 2,500
Location: Westminster, SW1P
Situated in the heart of Westminster, the Queen Elizabeth II Centre offers over 30 event spaces with stunning views of Big Ben and Westminster Abbey. It is a favourite for political, academic, and corporate conferences due to its prestige and central location.
4. Olympia London
Capacity: Up to 10,000
Location: Kensington, W14
Olympia is an iconic venue with Victorian grandeur and state-of-the-art facilities. Its multiple halls are suited to exhibitions and conferences of all sizes, with flexible layouts and high ceilings that offer creative scope for branding and staging.
5. Alexandra Palace
Capacity: Up to 10,250 (Great Hall & West Hall combined)
Location: Alexandra Park, N22
Affectionately known as “Ally Pally,” this historic venue offers a unique blend of heritage charm and modern amenities. The Great Hall is a majestic space for keynote sessions, exhibitions, or corporate entertainment, all set in 196 acres of parkland.
6. Tobacco Dock
Capacity: Up to 2,500
Location: Wapping, E1W
A stunning Grade I-listed warehouse space, Tobacco Dock is a creative and flexible venue suited to tech summits, experiential launches, and immersive conferences. Its mix of large halls and breakout areas offers ideal flow for large-scale multi-stream events.
7. Old Billingsgate
Capacity: Up to 2,400
Location: The City, EC3R
A striking Victorian building on the banks of the Thames, Old Billingsgate features an impressive Grand Hall with character and scale. It’s popular for conferences, gala dinners, and award ceremonies that seek a wow factor in a central location.
8. Troxy
Capacity: Up to 3,000
Location: Limehouse, E1
Originally a 1930s cinema, Troxy is now a fully restored Art Deco venue that blends vintage style with modern production capability. It’s perfect for product launches, town halls, or conferences with an entertainment edge.
9. Central Hall Westminster
Capacity: Up to 2,200 (Great Hall)
Location: Westminster, SW1H
A historic Methodist church turned prestigious conference venue, Central Hall Westminster sits opposite Westminster Abbey. It features a spectacular domed auditorium, making it ideal for keynote presentations, AGMs, and political gatherings.
10. Printworks London (currently undergoing redevelopment)
Capacity: Up to 5,000
Location: Canada Water, SE16
One of London’s most unique venues, Printworks was a disused printing factory turned cutting-edge event space. Known for its industrial aesthetic and vast scale, it’s ideal for bold, high-tech conferences and experiential brand events.
Final Thoughts
Whether you’re organising a global summit, a large-scale industry conference, or a national corporate gathering, London offers an array of venues capable of handling 1,000+ delegates in style. From purpose-built convention centres to breathtaking heritage sites, these venues pair capacity with character—ensuring your event is as memorable as it is impactful.
Need help choosing the right venue? Contact Best Venues London for expert, free venue-finding support tailored to your event requirements.
