The BBC Proms is an eight-week summer season of daily orchestral classical music concerts and other events held annually, predominantly in the Royal Albert Hall in central London. Robert Newman founded The Proms in 1895. Since 1927, the BBC has organised and broadcast The Proms. Each season consists of concerts in the Royal Albert Hall, chamber music concerts at Cadogan Hall (or occasionally other venues), additional Proms in the Park events across the UK on the Last Night of the Proms, and associated educational and children's events. Recently, concerts have been held in additional cities across different nations of the UK, as part of Proms Around the UK. The season is a significant event in British culture and in classical music. Czech conductor Jiří Bělohlávek described the Proms as "the world's largest and most democratic musical festival".

Prom is short for promenade concert, a term which originally referred to outdoor concerts in London's pleasure gardens, where the audience was free to stroll around while the orchestra was playing. In the context of the BBC Proms, promming refers to the use of the standing areas inside the hall (the Arena and Gallery) for which ticket prices are much lower than for the seating. Proms concert-goers, particularly those who stand, are sometimes referred to as "Prommers" or "Promenaders".

Promenade concerts had existed in London's pleasure gardens since the mid-18th century, and indoor proms became a feature of 19th century musical life in London from 1838, notably under the direction of Louis Antoine Jullien and Sir Arthur Sullivan. The annual series of Proms continuing today had their roots in that movement. They were inaugurated on 10 August 1895 in the Queen's Hall in Langham Place by the impresario Robert Newman, who was fully experienced in running similar concerts at Her Majesty's Theatre. Newman wished to generate a wider audience for concert hall music by offering low ticket prices and an informal atmosphere, where eating, drinking and smoking were permitted to the promenaders. He stated his aim to Henry Wood in 1894 as follows:

I am going to run nightly concerts and train the public by easy stages. Popular at first, gradually raising the standard until I have created a public for classical and modern music.

George Cathcart, an otolaryngologist, gave financial backing to Newman for the series (called "Mr Robert Newman's Promenade Concerts") on condition that Henry Wood be employed as the sole conductor. Wood, aged 26, seized this opportunity and built the "Queen's Hall Orchestra" as the ensemble specially devoted to performing the promenade concerts. Cathcart also stipulated (contrary to Newman's preference) the adoption of French or Open Diapason concert pitch, necessitating the acquisition of an entirely new set of wind instruments for the orchestra, and the re-tuning of the Queen's Hall organ. This coincided with the adoption of this lower pitch by other leading orchestras and concert series. Although the concerts gained a popular following and reputation, Newman went bankrupt in 1902, and the banker Edgar Speyer took over the expense of funding them. Wood received a knighthood in 1911. In 1914, anti-German feeling led Speyer to surrender his role, and music publishers Chappell & Co. took control of the concerts.

Although Newman remained involved in artistic planning, it was Wood's name which became most closely associated with the Proms. As conductor from the first concert (which opened with Wagner's Rienzi overture) in 1895, Sir Henry was largely responsible for building the repertoire heard as the series continued from year to year. While including many popular and less demanding works, in the first season there were substantial nights devoted to Beethoven or Schubert, and a programme of new works was given in the final week. Distinguished singers including Sims Reeves and Signor Foli appeared. In the first two decades Wood firmly established the policy of introducing works by contemporary composers (both British and international) and of bringing fresh life to unperformed or under-performed works. A bronze bust of Sir Henry Wood recovered from the ruins of the bombed-out Queen's Hall in 1941, and now belonging to the Royal Academy of Music, is still placed in front of the organ for the whole Promenade season. Though the concerts are now called the BBC Proms, and are headlined with the BBC logo, the tickets are subtitled "BBC Music presents the Henry Wood Promenade Concerts".

In 1927, following Newman's sudden death in the previous year, the BBC (which later based at Broadcasting House next to the hall) began running the concerts. This arose because William Boosey, then managing director of Chappell & Co. (the Prom proprietors), detested broadcasting and saw the BBC's far-reaching demands and intentions in the control of musical presentation as a danger to the future of public concerts altogether. He decided to disband the New Queen's Hall Orchestra, which played for the last time at a Symphony concert on 19 March 1927. He found it more expedient to let the Queen's Hall to the broadcasting powers, rather than to continue the Promenade concerts and other big series independently in an unequal competition with what he saw as effectively the Government itself. So the Proms were saved, but under a different kind of authority. The personnel of the New Queen's Hall Orchestra effectively continued until 1930 as "Sir Henry J. Wood and his Symphony Orchestra". When the BBC Symphony Orchestra (BBC SO) was formed in 1930, it became the main orchestra for the concerts. At this time the season consisted of nights dedicated to particular composers; Mondays were Wagner, Fridays were Beethoven, with other major composers being featured on other days. There were no Sunday performances.

With the outbreak of World War II in 1939, the BBC withdrew its support. However private sponsors stepped in to maintain the Proms, always under Sir Henry Wood's direction, until the Queen's Hall was devastated beyond repair during an air raid in May 1941. (The site is now occupied by the St George's Hotel and BBC Henry Wood House). The concerts then moved (until 1944) to their current home, the Royal Albert Hall, during the Promenade season presented by Keith Douglas in conjunction with the Royal Philharmonic Society (of which he was Secretary).