Cameroon will hold presidential elections on October 7, head of state Paul Biya said in a decree issued on Monday.
Elected in 1982, the 85-year-old is Africa's oldest and longest-serving president, but has yet to say whether he will bid for another term, although his supporters are already urging him to put his name forward.
The vote will take place in a context of mounting problems in the oil-rich state, which faces an insurgency by anglophone separatists in the west and bloody incursions by Boko Haram jihadists in the north.
The main opposition, the Social Democratic Front (SDF), has already designated its candidate, Joshua Osih.
Other declared candidates include Akere Muna, a lawyer and former vice president of Transparency International, and Maurice Kamto, head of the Movement for the Rebirth of Cameroon (MRC).