The provision of appropriate emotional support is influential in establishing a positive and stimulating online learning environment that can elevate students’ emotional well-being, improve their learning experience and enjoyment, and increase their academic achievements. In the present study we examine 16 papers on emotional support in online teaching and learning environments. We aim to understand (a) the emotional support given to online learners and (b) the effectiveness of emotional support in online teaching and learning environments. The review shows that the emotional support given to online learners includes empathy, understanding, motivation, and encouragement. These verbal and nonverbal emotional supports are mainly from teachers, family members, and peers as well as some online agents or applications. Most of the emotional supports influence online learners’ performance and have a favorable impact on their emotional states. The systematic review shows that there has been little research on technology-based emotional support and synchronous teaching and learning environments. We propose that more research should be carried out in these areas.