This is a partial list of Korea-related topics beginning with O. For Korean words starting with 어, see also under E.

O

• Ock Ju-Hyun
• Oei Invasion
• Okcheon
• Okjeo
• Ohmynews
• Oksusu cha
• Oldboy
• Olympic Stadium, Seoul
• Ondol
• Onnuri Ensemble
• Operation Paul Bunyan
• Oppert, Ernst
• Order of Merit for National Foundation
• Oriental Brewery
• Osan
• Owon (painter)