In the scenario of COVID-19, the online learning capacity has increased much more than the face to face or traditional learning. Due to the increased capacity of online learning in higher education, the quality of online learning has serious concerns. To achieve the minimum requirements of quality in online learning for sustainable development, it is important to review the quality assurance principles and strategies. A brief review of the literature was conducted to define the quality of online learning, presented some quality assurance indicators for online learning, and discussed some online learning models by selecting 27 published articles through inclusion and exclusion criteria for performing a systematic review of the literature. The review showed that learner-teacher interaction, learner's prompt feedback, learner's support service, applying appropriate media, tools for online learning, and planned documented technology application for the assurance of quality in online learning are important quality indicators. Some quality assurance models for online learning are also presented in this study for the implication of these models according to the learning requirement to ensure the online learning quality.