Visas are required by most non-residents except ECOWAS nationals. Ghana Missions and Embassies abroad will assist in issuing individual as well as group visas.
Subject to the conditions of the Immigration Act any person who is seeing to enter into Ghana;
a) Must be in possession of a valid passport or other travel document and valid visa to enter Ghana where applicable.
b) Must have been exempted from obtaining a visa to enter Ghana.
c) Must have his name endorsed upon a visa and is in the company of the holder or the visa.
d) Must have applied and been granted an emergency entry permit ; or
e) Must have been admitted to diplomatic status by the Government of Ghana.
Read more : http://www.ghanaimmigration.org/visa_info.html