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- Saunders Alexius Abbott, army officer in the East India Company, died in Brighton in 1894
- Steven Adescricketer for Sussex, was born in Brighton in 1982
- Richard Addinsell, composer of the Warsaw Concerto and many film soundtracks — lived in Chichester Terrace 1960–77; blue commemorative plaque adorns house
- William Addison FRS, physician, died in Brighton in 1881
- Harrison Ainsworth, lived in Kemp Town; wrote the novel Ovingdean Grange 1860
- Chemmy Alcott, Britain's number one Alpine Skier
- Elizabeth Allan, actress, lived in Arundel Terrace, Kemp Town in the 1950s
- Chesney Allen, comedian, one of Flanagan and Allen, born in Brighton in 1893
- Henry Allingham, briefly the world's oldest man, moved to St Dunstan's at age 109
- Emma Anderson, guitarist and songwriter of indie music bands Lush and Sing-Sing (band)
- Peter Andre, British-born Australian singer, has lived in Brighton
- Francis Anscombe, statistician, was born in Hove in 1918
- James Lloyd Ashbury, yachtsman and MP, lived in Brighton
- Richard Attenborough, actor (Brighton Rock, 10 Rillington Place), broadcaster and film-maker (Oh! What a Lovely War, Gandhi), brother of David Attenborough
- Michael "Atters" Attree, satirist, comedy writer and performer
- William Austin, artist, engraver and caricaturist, died in Brighton in 1820 aged 99
- Dean Ayass, television wrestling commentator
Read more about this topic: List Of People From Brighton And Hove