Romanian Championships or Romanian Championship may refer to:

• Liga I (football)
• Romanian Chess Championship
• Romanian Figure Skating Championships
• Romanian Gymnastics National Championships
• Romanian Rally Championship
• National American Football Championship of Romania
• SuperLiga (rugby)

• William Osorio
• William Osteen
• William Osteen, Jr.
• William Ostler (physician)
• William Oswell
• William oswell
• William Otter
• William Otto Adolph Julius Danckwerts
• William Otto Wolfe
• William Otway
• William Otway Boger
• William Outerbridge
• William Outram
• William Overend Priestley
• William Overton (bishop)
• William Overton (disambiguation)
• William Overton (Portland founder)
• William Overton Smith
• William Owen (Australian High Court judge)
• William Owen (British naval officer)
• William Owen (disambiguation)
• William Owen (footballer)
• William Owen (footballer, born 1884)
• William Owen (footballer, born 1906)
• William Owen (naval officer)