During the Covid-19 pandemic, the unprecedented closure of universities and schools has revived the application of fully online teaching and learning. This study explored the readiness for online learning of Thai EFL university students during the Covid-19 pandemic. The participants were 62 fourth year Business English major students under the Faculty of Humanities and Social Sciences, Buriram Rajabhat University, Thailand. The readiness for online learning in this study was divided into five dimensions: self-directed learning, motivation for learning, computer/Internet self-efficacy, learner control, and online communication self-efficacy. The research instrument was the Online Learning Readiness Scale (OLRS) survey questionnaire with a five-point-Likert scale. The obtained data were analyzed by mean and standard deviation. The results showed that Thai EFL university students entered the level of "ready and go ahead" towards online learning in the dimension of computer/Internet self-efficacy while the rest dimensions were at "ready but needs a few improvements" level. The implication of this study has great importance for Thai EFL teachers who are struggling to teach in this new medium and teach to the needs of their students to aid in their planning and will contribute to future teachers who will teach online platforms.