Oh

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Oh is an interjection with many uses, often said by people realizing something. (e.g. Oh, now I see.)

It may also refer to:

Abbreviations

A pronounced abbreviation for the number Zero
OH, an abbreviation for the U.S. State of Ohio (United States postal abbreviations)
Comair (IATA airline designator)
in chemistry:

is a USCS symbol for an organic-rich clay and/or silt of high plasticity
Olduvai Hominid
A former employee of the Appalachian Mountain Club's Hut System in the White Mountains of New Hampshire (Old Hutmans Association)
Old Harrovian, a former pupil at Harrow School, England
Old Herefordian, a former pupil of Hereford Cathedral School
Old Haberdasher, a former pupil of The Haberdashers' Aske's School, England
Owen Hart

"Oh," a song by Fugazi from their 2001 album The Argument
"Oh!", a song by Sleater-Kinney from their 2002 album One Beat
"Oh (Dave Matthews song)", a song by Dave Matthews from his 2003 album Some Devil
"Oh (Ciara song)", a 2004 song by singer Ciara released as a single in 2005
"Oh! Darling", a song written by Paul McCartney and performed by the Beatles
"Oh! Gravity. (song)," by rock band Switchfoot, or its album, "Oh! Gravity."
"Oh, Boy! (song), a song by Buddy Holly and the Crickets, released in 1957.