Abstract We report on archival XMM-Newton and post-outburst Swift observations of the newly discovered dwarf nova ASASSN-21kt. Its pre-outburst X-ray emission is consistent with that of a collisionally ionized, thermal plasma with kT = 8.1 − 2.5 + 10.2 keV and L _{X 0.2–12 keV} = 7 × 10³² erg s⁻¹, with no clear modulation. Multiple optical outbursts revealed by Gaia and time evolution of the last one followed by the All-Sky Automated Survey for Supernovae, and X-ray properties presented here support the dwarf nova classification of ASASSN-21kt.