In sports, the relative age effect (RAE) refers to performance disadvantages of children born late in the competition year compared to those with birthdays soon after the cutoff date. This effect is derived from age grouping, a strategy commonly used in youth sport programs. The purpose of age grouping is to decrease possible cognitive, physical, and emotional differences among sport participants. In spite of the efforts to equate playing conditions, youth athletes born early in the competitive age group are selected to be part of squads more often than late-born athletes, even within the same 1-year category. Thus, the purpose of this study was to expand the literature to examine the existence of RAE among young female volleyball players. Women's volleyball is a highly competitive sport in Brazil. A stronger RAE is expected for more popular sports in which competition for a spot on the team is greater. (Contains 1 table.)