Shahrina IsmailMohammad Ilham Husaini Mohammad NazeriSharifah Fairuz Syed Mohamad2024-05-302024-05-302021Ismail, S., Mohammad Ilham Husaini Mohammad Nazeri, & Sharifah Fairuz Syed Mohamad. (2021). The Impact of Covid-19 on Online Teaching and Learning (TnL) Towards Teachers in Malaysia. Malaysian Journal of Science Health & Technology, 7(2), 15–22. https://doi.org/10.33102/mjosht.v7i2.1692601-000310.33102/mjosht.v7i2.169https://mjosht.usim.edu.my/index.php/mjosht/article/view/169https://oarep.usim.edu.my/handle/123456789/15440teachers; impact; effectiveness; challenges; school reopeningAs COVID-19 hits the world shockingly, most nations worldwide have agreed to put educational institutions temporarily close. However, education has not stopped, but to go fully online as schools and universities could provide remote education. In this case, teachers have been struggling to adapt to the new norm to stop disease transmission. Thus, this study was conducted to investigate the impact of Online Teaching and Learning (OTL) on teachers during COVID-19. The questionnaire was distributed randomly online among 320 teachers in Malaysia. SPSS has been used to analyse the completed questionnaire to obtain descriptive and inferential statistics. Three variables that have been used in this study were effectiveness, challenges, and school reopening using Cronbach’s alpha, hypothesis testing, t-test, ANOVA, Pearson correlation, and multiple linear regression. This study has shown that most teachers were affected by using online as a new method of teaching. A negative correlation between effectiveness and challenges has implied that increasing challenges would decrease online teaching effectiveness. Besides, many of the components show a significant difference in the variables in terms of socio-demographic profiles. The findings obtained would help the higher administration tackle challenges the teachers face and know the effectiveness of online teaching and learning.enteachers, challenges, school reopening, TnL, Covid-19Article152272