This is a correction notice for ‘X-ray Swift observations of SN 2018cow’ (DOI: https://doi.org/10.1093/mnrasl/sly235), which was published in MNRAS 480, L146–L150 (2018). The publisher regrets to inform that figures 1 and 3 were mistakenly swapped over in this Letter. The correct figures can be found below. In addition the authors point out that in the y axis of figure 2 and the caption and columns 2 and 3 of Table A1 the units were incorrectly given as ‘erg cm−2 s−1’ instead of ‘erg s−1’. (Figure Presented).