OTH may refer to:

• Optical Transport Hierarchy, in telecommunications
• Other than honorable discharge, a US military discharge
• Over-the-horizon radar
• Over the horizon boat, a type of cutterboat in the U.S. Coast Guard.
• Airport code for Southwest Oregon Regional Airport
• Our Tampines Hub, a community building, Singapore
• Opportunity to hear, a term used in radio advertising.
• One Tree Hill (TV series), a 2003–2012 American drama series.

• 0th (i.e. "zeroth")

This disambiguation page lists articles associated with the title OTH.
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