or. oikea raja (Right Border)
os. osasto (Detachment)
OBB Old Boys Bataljon (Old Boys Battalion)
OhjLv Ohjuslaivue (Missileboat Squadron)
OKH Oberkommando des Heeres (Land Force HQ (german))
OKW Oberkommando der Wehrmacht (Supreme HQ (german))
OTE opastus- ja täydennyselin (Advisement And Replenishment Unit)
OTK Osuustukkukauppa (Wholesale Trade)
Oul.skp. Oulun suojeluskuntapiiri (Oulu Civil Guard District)
Oul.sp. Oulun sotilaspiiri (Oulu Military District)

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