This chapter reviews research on the efficacy of training Working Memory (WM) in an educational context. We begin with a brief description of WM, its relation to classroom constructs, an overview of WM training programs, followed by classroom recommendations pertaining to several case studies. We characterize WM training programs into two categories: those that are narrow in scope and those that are broad in scope. Narrow-scope WM training programs are similar to a WM test, while broad-scope WM training programs train WM in the context of broader abilities, such as executive function, attention, or learning skills. Additionally, we discuss the efficacy of WM training with respect to near- or far-transfer effects. Near transfer refers to improvements that are similar to the training program, such as improvements in WM tasks, while far-transfer effects refer to improvements in skills related to the area of training, such as other executive function skills such as inhibition, updating, and planning, as well as attention and fluid intelligence (IQ). We also report whether transfer effects are short-lived or long-lasting (maintenance effects). Finally a discussion regarding implementing WM training in the classroom and future directions are provided.