Here I report on the reproductive characteristics of an insular population of the lacertid lizard Podarcis hispanica, which inhabits the Cíes Islands, an archipelago formed by three small islands off the northwest coast of Spain. The clutch characteristics of the population were investigated on the basis of clutches laid by pregnant females captured on these islands in 1999 and 2000. Other data were obtained principally by mark-recapture experiments. The egg-laying cycle of live females was determined by ventral palpation. Enlarged follicles were detected from March to July, and the laying period extended from April to the second half of July. The larger females initiated reproductive activities early in the season and produced up to three clutches annually, whereas the smaller individuals laid only a single clutch. Reproductive performance was related mainly to female size. Clutch size, individual egg mass, clutch mass, and hatchling size increased with the length of the females. I also examined the extent to which the reproductive characteristics of this insular population of P. hispanica diverged from those in other populations of the same species. I found no pronounced differences between these populations and other mainland populations of the same species of like body size. Several hypotheses may be proposed to explain the lack of major differences in reproductive characteristics (egg size and number). The first has to do with the relatively short length of time that this population has been isolated, and, therefore, it would still be too early for any divergence to have manifested itself. A second hypothesis is that the selection gradient for reproductive traits on the Cíes Islands may have remained similar to that on the mainland. A third hypothesis deals with the limitations imposed by the reduced body volume of this small-sized species on egg growth in conjunction with the shorter laying period of this population in an Atlantic climate.