This article reviews research on motivation in the academic domain of writing situated within a social cognitive perspective. First we summarize major findings related to 4 theorized components of human motivation--self-efficacy beliefs or perceived competence, mastery and performance goal orientations, task interest and value, and attributions for success and failure. For each component we also offer general instructional recommendations gleaned from the literature. Next we discuss how these components play a role in writing motivation, with particular emphasis on self-efficacy for writing skills versus writing tasks. Then we present findings from studies that have examined the motivational characteristics of individuals who struggle with writing, including those with disabilities, and interventions designed to enhance motivation to write. Finally, we offer suggestions for future research in writing motivation. (Contains 1 figure.)