With this study, it is aimed to adapt the Online Teaching Effectiveness Scale into Turkish Language. The adaptation process has been done within four study groups. The first group took part in the study after having the Turkish form of the scale as required according to the translation steps. The study has been done with the MCBU Faculty of Education during the 2021 Spring Term. With the first study group, language validity was ensured with 30 participants by applying the Turkish and English versions of the scale in an interval of two weeks. According to language validity findings the Spearman's Rank Order Correlation value has been found above 0.70. Then pilot study has been done with second group with 62 participants. The total correlation values of the items are between 0.55 and 0.80. The third group consisted of 436 participants and after second run the CFA results are found like that; X[superscript 2] / df = 3.582, RMSEA = 0.80, SRMR = 0.35; CFI = 0.95; TLI = 0.94, NNFI = 0.95. With the third study group the validation study has been finished and continued to reliability study. The fourth and the last group which consisted of 96 participants and the applications has been done in an interval of three weeks. According to the Cronbach's Alpha values each of the dimensions and the total of the scale have points between 0.70 and 0.97. The test-retest values are between 0.72 and 0.94. Based on the findings the Turkish version of the scale is valid and reliable for usage.