XO

Xo or XO may refer to:

Arts and entertainment

 * XO (record label), founded by the Weeknd
 * XO (Elliott Smith album), 1998
 * XO (Leathermouth album), 2009
 * X-O Manowar, a Valiant Comics superhero
 * Super Robot Wars XO, a 2006 tactical role-playing video game
 * Xiomara "Xo" Villanueva, a character on Jane the Virgin, an American satirical telenovela

Songs

 * "XO" (song), 2013, by Beyoncé from her self-titled studio album
 * "XO", 2005, by Fall Out Boy from the album From Under the Cork Tree
 * "XO", 2010, by Mike Posner from the album 31 Minutes to Takeoff
 * "XO", 2015, by The Eden Project
 * "XO", 2022, by girl group Citizen Queen
 * "XO (Only If You Say Yes)", by K-pop boy group Enhypen
 * "X.O.", 1996, by Luniz from the film soundtrack Original Gangstas
 * "XO / The Host", 2011, by the Weeknd from his third mixtape Echoes of Silence

Businesses

 * XO Communications, a telecom company
 * XO Group, a media company

Food and drink

 * XO sauce, a spicy seafood-based dressing sauce
 * XO (extra old), a grade of cognac liquor

Science and technology

 * XO Telescope or its exo-planet survey
 * OLPC XO, a laptop produced by the One Laptop per Child association
 * XO sex determination system, a chromosomal system used to designate sex of some species of insects, arachnids, and mammals
 * XO, heterogametic male designation under this system
 * Turner syndrome, a genetic condition in which one of the sex chromosomes is absent
 * Xanthine oxidase, an enzyme that catalyzes the oxidation of hypoxanthine to xanthine
 * Xylenol orange, a chemical indicator for metal ions, used in titrations
 * Crystal oscillator (deprecated abbreviation: XO), an electronic circuit

Other uses

 * Executive officer or XO, as in a military or police force
 * Hugs and kisses or XO
 * LTE International Airways's IATA airline code