The purpose of this chapter is to outline the empirical work to date regarding the importance of individuals’ subjective perceptions of mental fatigue for self-control. We first review existing research on the causal link between perceptions of mental fatigue and self-control. Next, we discuss factors shown to impact or alter individuals’ perceptions of mental fatigue. We then present a meta-analysis to provide insight into the general impact of perceived mental fatigue on self-control. Finally, we speak to the implications of this research for the manner in which self-control is conceptualized within a limited resource model specifically as well as models of self-control more broadly.