XO
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XO may refer to:
- Executive officer (military)
- XO grade of cognac, where the youngest brandy is at least 7 years old.
- Crystal oscillator
- The Xbox 360 (The O looks like a circle 360°)
- Tic-tac-toe (a game)
- Eastern Orthodoxy (Christianity), from the Greek: Xristianos Orthodoksos (Χριστιανός Ορθόδοξος)
- Crossover track
- XO Communications, a telecom company
- Kisses (X) and hugs (O) (may be repeated), a common postscript to a letter (often a love letter)
- A notation for denoting the sex chromosomes of an individual with Turner syndrome
- Badtz-Maru, a character from Sanrio's Hello Kitty series
- The album XO by Elliott Smith.