XX
XX or xx may refer to:

20 (number), Roman numeral XX

Film and TV
XX (film), a 2017 anthology horror film
"XX", an episode of CSI: Crime Scene Investigation (season 4)
XX, the production code for the 1969 Doctor Who serial The Seeds of Death
XX (web series), a 2020 South Korean web series
XX (organization), a fictional organisation in the comic and game XIII

Genetics
XX sex chromosomes, in the XY sex-determination system
XX male syndrome, also known as de la Chapelle syndrome, a rare congenital intersex condition resulting in a phenotypical male with two X chromosomes
XX gonadal dysgenesis, a type of female hypogonadism resulting in non-functioning ovaries
XX chromosome, in the XO sex-determination system

Music
The xx, a British indie band
X_______X (band), a Cleveland no wave band

Albums
Toto XX, a 1998 album by Toto
XX (Mushroomhead album), 2001
xx (The xx album), 2009
XX (Great Big Sea album), 2012
XX – Two Decades of Love Metal, a 2012 compilation album by HIM
XX (O.A.R. album), 2016
XX (Mino album), 2018
XX, a 2018 album by Note-oriety
+ + (EP), a 2018 EP, repackaged as [X X] in 2019, by Loona

Songs
"xx", a song by Hayley Kiyoko from Expectations
"XX", a song by Feid from Ferxxo (Vol 1: M.O.R)

Organisations
XX Bomber Command, an inactive United States Air Force unit
XX Corps (disambiguation)
Legio XX Valeria Victrix or Legion XX, a legion of the Roman Empire

Other uses
XX (novel), a 2020 novel by Rian Hughes
XX System or Double-Cross System, a British deception operation in the Second World War
Les XX, a group of twenty Belgian painters
Dos Equis or XX, a brand of Mexican beer
xx, to express exponentiation in the initial version of the FORTRAN programming language

See also
All pages with titles containing XX
20 (disambiguation)
Double Cross (disambiguation)
X (disambiguation)
XXX (disambiguation)
XXXX (disambiguation)