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Finding the perfect seminar room in London for 300 attendees can elevate your event to new heights. With a variety of modern and versatile spaces available, you can host impactful seminars that engage and inspire. Consider factors such as location, technology access, and layout options to ensure a seamless experience. London's seminar rooms cater to diverse needs, making them ideal for corporate training sessions or industry conferences.

London

United Kingdom

The United Kingdom has an excellent transport infrastructure, with a wide variety of options for getting around.

TRANSPORT

The United Kingdom is home to some of the most iconic landmarks in the world, from Big Ben to Stonehenge.

LANDMARKS

The United Kingdom has a rich cultural heritage, with a wide variety of traditional music, art and cuisine.

CULTURE

By plane, train, underground, bicycle and more, London has some of the best transport links in the world.

Icons that make London know the world over, from Buckingham Palace to the House of Parliament.

Home to Theatreland, world renowned music venues, museums and a piece of history on every corner.

Seminar Rooms in London for 300 people

Seminar Rooms

A versatile auditorium with tiered seating and AV capabilities, ideal for corporate events and receptions.

In the heart of The Mermaid is the Auditorium, with tiered seating, excellent sightlines, comprehensive lighting and complete audio visual capabilities. The amazing space comes with a 350sqm stage perfect for any corporate event from product launches, awards ceremonies, sit down dinners on the stage to drinks receptions, networking events and stage reveals.

"Engaged audience at a modern conference in The Mermaid London auditorium."

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Grand piano on stage in empty Mermaid London auditorium, perfect for intimate events.

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Vibrant networking event in The Mermaid London with dramatic lighting and stylish decor.

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Theatre

Events

Auditorium

The Mermaid London

A grand historic hall in Central London for up to 2,000 guests, ideal for conferences and ceremonies.

The magnificent Great Hall stands as the centrepiece of Central Hall Westminster,
accommodating gatherings of up to 2,000 attendees. This cozy ambiance fosters optimal
interaction during AGMs, Conferences, and various special occasions, including Awards and
Graduation Ceremonies. The Great Hall seamlessly caters to diverse events, ranging from
classical candlelight concerts to keynote speakers, equipped with cutting-edge audio-visual
and sound systems. Noteworthy for housing the largest domed ceiling in Europe, this venue
offers a breathtaking setting. 

Great Hall Westminster with tiered seating, ideal for conferences and performances.

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Great Hall Westminster interior with ornate design, ideal for upscale events and weddings.

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Great Hall in Central Hall Westminster with ornate ceiling, ideal for conferences and performances.

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Great Hall Westminster auditorium with blue lighting for impactful conferences and presentations.

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Great Hall Westminster concert with vibrant lighting and ornate architecture.

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Standing

The Great Hall

Central Hall Westminster

Historic circular event space with a glass dome, ideal for dinners and parties up to 372 guests.

The Assembly Hall is a Grade II listed event space which was built in 1939, and designed by world-renowned architect, Sir Herbert Baker. 

Features include natural daylight, polished English oak panelling and the circular space's architectural focal point - a striking 30-foot glass dome. 

The iconic 519 square metre circular space with its ceiling height of 9.7m hosts Charity Fundraising Dinners, Awards Dinners, Private Dining, Christmas Parties, Summer Parties, and Gala Dinners for up to 372 guests, or dinner dances for 300. 

Elegant Assembly Hall in Church House Westminster, perfect for gala or corporate events.

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Elegant Assembly Hall in Church House Westminster, ideal for gala and corporate events.

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Elegant banquet hall in Church House Westminster, ideal for conferences and gala dinners.

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Gala event in Assembly Hall, Church House Westminster with elegant tables and ambient lighting.

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Elegant banquet hall in Church House Westminster, ideal for galas and awards ceremonies.

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Dining

Assembly Hall

Church House Westminster

A historic hall with a 400-capacity, perfect for conferences, seminars, and presentations.


The Great Hall is the largest event space, accommodating up to 400 guests. As a versatile blank canvas, it's ideal for a wide range of events, including conferences, seminars, press activities and presentations. The Great Hall features three large screens, a stage, and a podium, providing an excellent platform for showcasing and presenting to your audience. It supports various set-ups, including theatre, classroom and round tables, tailored to your event's specific needs. Perfect for AGMS, product launches, and networking events, The Great Hall combines flexibility with functionality.

Great Hall at One Moorgate Place, elegant event space for meetings and conferences.

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Great Hall at One Moorgate Place, theater-style seating for conferences and presentations.

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Great Hall at One Moorgate Place, purple-lit conference room for events and presentations.

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Great Hall at One Moorgate Place with elegant chandelier, ideal for upscale events.

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Great Hall at One Moorgate Place, spacious stage for conferences and presentations.

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Great Hall at One Moorgate Place, versatile meeting space for corporate events.

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Reception

Business

Great Hall

One Moorgate Place

A large, versatile auditorium in a central hotel, perfect for conferences and events up to 450 guests.


Situated on the First floor of the centrally-located Leonardo Royal London City Hotel, the Auditorium is a generously-sized meeting and events space, impressively accommodating up to 450 delegates. The room can also be split into the Lion and Bell suites, for slightly smaller events of up to 180 delegates. 

Modern lobby of The Auditorium, Leonardo Royal Hotel London City for events and meetings.

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The Auditorium

Leonardo Royal Hotel London City

An opulent ground floor room with ornate features and a private terrace in a historic central London venue.

The Carlton Room on the ground floor used to be the smoking room of the United Service Club.  It is adorned with many rich decorative features including the dramatic Ionic columns in the centre of the room.  These are finished in scagliola; a skillful plaster treatment designed to imitate marble and add to the splendour in the room.  The walls are also covered by gold leaf on linen; a very expensive and delicate treatment enriching the overall impression of opulence.

The south facing doors open onto a private terrace with views across the garden. 

Elegant banquet table in Carlton Room, 116 Pall Mall, perfect for upscale events and celebrations.

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Elegant couple ascending grand staircase at Carlton Room, perfect for weddings and upscale events.

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Carlton Room at 116 Pall Mall, elegant venue for corporate events and weddings.

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Bride in minimalist gown at Carlton Room, 116 Pall Mall, perfect for elegant weddings.

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Couple embracing in Carlton Room, 116 Pall Mall, perfect for romantic weddings.

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Outdoor networking event in Carlton Room, 116 Pall Mall, with lush greenery and stylish guests.

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Stylish couple in matching "Just Married" denim jackets at Carlton Room wedding.

Seminar Rooms in London for 300 people

Trending Seminar Rooms Venues in London for 300 People

The Mermaid London

Central Hall Westminster

Church House Westminster

One Moorgate Place

Leonardo Royal Hotel London City

116 Pall Mall

De Vere Grand Connaught Rooms

Swan at The Globe