OCA ko Oca na iya nufin to:   Kotun Daukaka Kara na Ontario, wanda ake kira Kotun Daukaka Kara ta Ontario Ofishin Abokin Ciniki (Kanada), hukumar masana'antu ta Kanada Kwamitin wasannin Olympic na Asiya, hukumar gudanar da wasanni a Asiya Hukumar Shirya Laifuka da Kuɗi ta New Zealand, wacce aka fi sani da Hukumar Laifin Laifuka Hukumar Shirya Laifuka ta British Columbia (1999–2004), magabacin Sashin Ƙarfafa Ƙarfafa Sojoji na Musamman.