The first Danish record of the social parasitic ant Myrmica hirsuta Elmes is reported from the Molsbjerg, Jutland. Eight colonies of the host species Myrmica sabuleti Meinert were examined and 3 were found to be infested. Two nests contained a large number of sexuals and a few workers of M. hirsuta, and a few specimens of the myrmecophilous beetle Atemeles emarginatus Paykull. This was the first record of workers for M. hirsuta. The overall sex ratio of the parasites in these nests was highly female biased. The M. hirsuta workers are described and differences between the size of the sexuals reared by the two host colonies are discussed.