A substantial literature has studied gender differences in political participation in Western industrialized democracies, but little is known about such gaps in sub-Saharan African nations. Using 2005 Afrobarometer data, this paper presents a systematic investigation of the gender gap in political participation across 18 sub-Saharan African countries. In line with cultural isomorphism, patterns in gender gaps across different types of participation generally mirror those of Western democracies, with small to no gender gaps in registration to vote, but substantial gaps in less institutionalized types of participation. Yet, the remaining large gaps cannot be explained by gender differences in socioeconomic characteristics and political attitudes as suggested in studies on Western industrialized nations. Finally, substantial cross-national differences within the sub-Saharan African are found, substantiating the importance of more fine-grained examinations of variation across sub-Saharan African nations. (Contains 5 tables, and 11 footnotes.)