O8

O8 or O-8 may refer to:

• Douglas O-8, an airplane
• Oasis Hong Kong Airlines, a defunct Hong Kong airline
• Octaoxygen (O₈) an allotrope of oxygen
• Omaha/8, a poker variant
• Siam Air, a defunct Thai airline
• , a O-class submarine of the United States Navy
• O-8, a pay grade of the uniformed services of the United States
• HMS H6, also known in the Royal Netherlands Navy as HNLMS O 8

See also

• 08 (disambiguation)
• 8O (disambiguation)