Londinium was the name of London, England during the Roman period.
Londinium may also refer to: Londinium (film), a 2001 romantic comedy film Londinium (album), by the band Archive, or the title song "Londinium" (Catatonia song), 1999 Londinium (Batman), a location in the 1960s television series Londinium, a fictional planet in the TV show Firefly