O, or o, is the fifteenth letter and the fourth vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide.

O, the fourth vowel of the modern alphabet, corresponding to the Semitic ayin, which represented a breathing and not a vowel. The Semitic form may have derived from an earlier sign representing an eye.

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Did you know? Words Starting With O Browse 9,760 words and phrases that start with the letter O, from oaf to ozotype.

O is used to mean zero, for example when you are telling someone a phone number, or mentioning a year such as 1908.