Sheikh Ibrahim El-Zakzaky, leader of the Shiite movement and his wife Zeenat were released after six years in detention.
The couple, accused of murder and imprisoned since 2015, was acquitted on Wednesday by the court in Kaduna (North) and released.
According to one of their lawyers, the court acquitted Sheikh Ibrahim Zakzaky and his wife of all charges against them.
“They have been released today. We will certainly seek damages from the Kaduna State government for all the deprivation and suffering suffered by our client,” added the lawyer Sadau Garba.
Aged 68, the leader of the Islamic Movement of Nigeria (IMN), now banned, had been arrested in December 2015 after the repression of a demonstration that had left several hundred dead.
He had then lost his right eye and is likely to lose the left, according to his lawyers.