Angola has previously received little attention from marine phycologists. Thirty known papers mention marine macro-algae and together list less than 50 species. This paper deals with the results of a survey carried out during January and February 1974: the number of reported species is now more than doubled. The species characterizing the littoral zones of rocky shores in this country are largely also to be found along the Guinea Coast, although minor variations do occur. The affinities of the Angolan marine algal flora are overwhelmingly with the Gulf of Guinea flora; there is a small but distinct transitional element, such as Plocamium beckeri, P. suhrii and Acrosorium maculatum, confined to localities in the south of Angola.