The crowd in the town of Ogbo were celebrating Barcelona's victory after last night's match when the bus drove into them. A police spokeswoman said 10 people were injured and the driver was arrested.
"The driver had passed the crowd then made a U-turn and ran into them," she said.
Barcelona beat Manchester United 2-0 in what was hailed as a "dream final" between two of Europe's best clubs. Both teams have large fan bases in Nigeria, Africa's most populous nation.