The Adelphi Theatre's history dates back to 1806. This site has seen the construction of four different theatres over the years, with the current one being the last. The first of the lot was the ‘Sans Pareil’, which operated until 1819 when it sold and was renamed ‘The Adelphi Theatre’. After a few changes in 1829, this theatre became known as ‘Theatre Royal Adelphi’. In 1858, a second theatre was constructed under the name 'Theatre Royal, New Adelphi.' In 1901, a third building was brought up to provide a new frontage; this became The Royal Adelphi. 

The Adelphi Theatre opened in 1930 and was known as the 'Royal Adelphi Theatre' at that time. 'Royal' was removed from the theatre's name in 1940, and since then it has simply been called The Adelphi Theatre.

The Adelphi Theatre is the fourth theatre on its site, though the earlier theatres have undergone many reconstructions. Some parts of those buildings are still incorporated into their successors. Art Deco designer Ernest Schaufelberg created the Adelphi Theatre's clean geometric lines during the 1930s when the theatre was rebuilt.

The newly built Adelphi Theatre was designed without any curves. The entire inside and out design is composed of straight lines and angles. The angle of thirty-two degrees predominates throughout the design.

‘The Way of an Eagle’, ‘Magnolia Street’, ‘One Man, Two Guvnors’, ‘Sunset Boulevard’, ‘My Fair Lady’, ‘Me and My Girl’, and ‘Chicago’ are some of the most notable productions.

• Assistive Listening System: The theatre has an Infrared system in place. Please note that headsets are available on a first-come, first-served basis. They can be found in the Cloakroom. Note: The Assistive Listening System is not available in Stalls rows R-X, Dress Circle rows J-O, and Upper Circle rows F-O.
• Guide Dogs: Adelphi Theatre welcomes guide dogs into the theatre. If you find the noise level to be too loud, the theatre staff will gladly watch over your dog.  Note: The theatre can watch over only four dogs at a time.
• Bar: There are four bars in the theatre and all bars serve wine, champagne, beer, tea and coffee.
• Cloakroom: A cloakroom is available at the theatre. You can check in items for £1 each.
• Toilets: Male and female toilets are present at each level of the theatre.

• The Stalls section has level access and two dedicated wheelchair park spaces are present in Row X. Any aisle seat in the Stalls can be used by customers transferring from a wheelchair into a theatre seat.
• Accessible Toilets: Located in the Foyer Stalls. Assistance and guide dogs are allowed at the venue.
• The main foyer bar, the Vivian Ellis Bar at the front of the Stalls auditorium, the Cloakroom, and confectionery and souvenir kiosks all provide step-free access.
• There are two spaces for wheelchair users at the rear of the section, however, transfer seating is available to any of the Stalls' aisle seats.
• Please note that there is space for storing only four wheelchairs in the Cloakroom.

• The sooner you book your tickets, the better chance you have of getting desirable seats at an affordable price.
• Make sure you're punctual for your show. Most West End shows won't let late attendees in.
• You can bring snacks into the auditorium, but please be aware that hot food is not allowed.
• Make sure to bring a light sweater with you to the theatre in case it gets chilly as the theatre is air-conditioned.
• Adelphi Theatre does not allow glass containers inside the auditorium for safety reasons, so all drinks will have to be transferred to plastic cups before entering.

• Byron Strand: This is the place to come for a quick, delicious burger. Byron Strand is renowned for its delicious burgers made from Scottish beef.
• Zizzi: This great Italian restaurant serves up some scrumptious pizzas and pasta.
• Big Easy Bar.B.Q & Lobstershack: Delicious American fare and barbecue make this place the perfect destination for meat lovers before a show.
• Lokhandwala: This restaurant is located a bit away from Adelphi theatre and serves up some incredible Indian cuisine.
• Milk Train: If you have a sweet tooth, you will love Milk Train. They serve fantastic cotton candy and ice cream that will tantalize your taste buds.