This proceedings contains a summary of the single top quark production cross section measurements based on $\sqrt{s}=$ 8 and 13 TeV datasets collected by the ATLAS experiment at the LHC, presented at the European Physical Society Conference on High Energy Physics. In the $t$-channel, the fiducial and the inclusive production cross sections of the top quark and top antiquark, and the ratio of top quark and top antiquark cross sections are presented. In addition, the measurements of the differential cross sections are presented. Measurements of the inclusive and the differential production cross sections of a single top quark in association with a $W$ boson are included, as well as the first measurement of the quantum interference between $tW$ and top quark and top antiquark pairs. The first evidences of the single top quark production through $s$-channel and the single top quark production in association with a $Z$ boson are presented.