A citadel is a castle, fortress, or fortified center. Citadel may also refer to: Places Citadel of Erbil , a palace in Erbil, iraq Citadel of Aleppo, a palace in Aleppo, Syria Citadel, Calgary, a neighbourhood in Calgary, Alberta, Canada Citadel Hill (Fort George), a fortified hill in Halifax, Nova Scotia, Canada Citadel Island, Victoria, Australia Arts and entertainment Fictional entities Citadel (comics), a fictional alien empire in the DC Comics universe Citadel, in Oldtown, a library and medical school run by maestres, in George R.R. Martin's A Song of Ice and Fire universe Citadel (Half-Life), headquarters for Wallace Breen in City 17 in Half-Life 2 Film and television Citadel (film), a 2012 film Citadel (TV series), an upcoming Amazon Prime Video series Gaming Citadel (video game), by Superior Software Citadels (card game), a German-style card game Citadels (video game), a 2013 Arthurian video game Literature Citadel (2011 novel), a novel by science fiction writer John Ringo Citadel (1957), a non-fiction book by William S. White Music Citadel (Ne Obliviscaris album) Citadel (Starcastle album) Citadel, an album by Muslimgauze "Citadel" (song), a song by the Rolling Stones Brands and enterprises Citadel Broadcasting, an American broadcast holding company Citadel Films, a defunct Indian film studio Citadel LLC, a hedge fund management company Citadel Miniatures, a miniatures company owned by Games Workshop Citadel Press, a publishing company Citadel Records, an Australian independent record label Citadel Theatre, Edinburgh, Scotland Computing Citadel (malware), a ZeuS-based botnet alleged to have stolen over US$500,000,000 from personal bank accounts Citadel (software), a BBS software Citadel/UX, an implementation of Citadel that has evolved into a modern groupware platform Other uses Armored citadel, protective enclosure in a ship Halifax Citadels, a defunct American Hockey League team Operation Citadel, part of the World War II Battle of Kursk Salvation Army citadel, a Salvation Army meeting place See also Citadelle (disambiguation) Cittadella (disambiguation) Royal Citadel (disambiguation) The Citadel (disambiguation)