Resumen:
This paper certifies the presence of the family Opilioacaridae in the Iberian Peninsula. It is represented by a new species of the Order Opilioacarida, Opilioacarus baeticus, from three localities, plus a photographic record, from southern and southeastern Spain. O. baeticus is described based on adult of both sexes and female tritonymphal instar. A key to genera of the family Opilioacaridae and species of the genus Opilioacarus is given.