Mutanen Bassa ƙabilar Afirka ta Yamma ne waɗanda asalinsu 'yan asalin kasar Liberiya ne. Sun kafa mafi rinjaye ko kuma wasu tsiraru a cikin kananan hukumomin Liberia na Grand Bassa, Rivercess, Margibi da Montserrado. A cikin babban birnin Liberia na Monrovia, su ne mafi yawan kabilu. Tare da yawan jama'a kusan miliyan 0.57, sune kabila ta biyu mafi girma a cikin Laberiya (13.4%), bayan mutanen Kpelle (20.3%). Hakanan ana samun ƙananan al'ummomin Bassa a Saliyo da Ivory Coast. Mutanene Bassa suna magana da yaren Bassa, yare ne na Kru wanda ke da asalin harsunan Nijar-Congo. Suna da nasu tsarin rubutu na hoto amma ba a amfani da shi a cikin karni na 19, an sake gano shi tsakanin bayin Brazil da West Indies a 1890s, kuma an sake sake gina shi a farkon 1900 ta Thomas Flo Darvin Lewis. Rubutun da aka farfaɗo da alamun ana kiransa Ehni Ka Se Fa. A cikin yarukan gargajiya, ana kiran mutanen Bassa da sunan GbBambog-Mbogsa ko Bambog-Mbog.