This chapter presents motivational theories beneficial for language learning with examples from author’s experience to illustrate implications of theories. Four theories are presented in this chapter; stimulus appraisal, motivation and attention, self-determination, and mindset theories. Stimulus-appraisal theory explains how a person creates value system and how it relates to language learning motivation. Motivation and attention topic illustrates how stress and attention affect motivation in language learners, while self-determination theory suggests the importance of intrinsic motivation in language learning and how educators can positively influence learners’ intrinsic motivation. Lastly, mindset theory shows how fixed and growth mindsets towards own abilities can help or hinder language learning. These theories provide us with useful implications for improving motivation in language learners.