The ruling revives the African Democratic Congress group seeking to field a challenger to President Bola Tinubu in the January 2027 presidential election.
The court overturned an earlier judgment that had threatened to derail one of Nigeria's main opposition parties ahead of the wider 2027 national polls.
The decision strengthens the ADC's ability to organise for the election campaign and preserves an opposition platform in Africa's most populous country.
With conflicting court orders still active, can the ADC truly field a unified candidate against President Tinubu?
A new law bars courts from party politics, so why did the Supreme Court just pick a party's leader?