For a paleomagnetic study of the Upper Cretaceous of the Netherlands Leeward Antilles, we have analyzed 187 oriented samples from the complex norite-tonalite batholith and the diabase-schist-tuff formation on Aruba and 44 oriented samples from various igneous units of the Washikemba Formation on Bonaire. Both alternating field and thermal demagnetization procedures were used to demagnetize the samples. Most of the cores yielded univectorial Zijderveld diagrams above 10--20 mT or 400 ¿C. Virtual geomagnetic poles calculated from site means were then compared with equivalently aged poles for cratonic South America and other Caribbean sites. The Washikemba Formation of Bonaire and the diabase-schist-tuff formation of Aruba yield poles that are similar to those of Guajira (Colombia) and the Caribbean Mountains of northern Venezuela, whereas they are rotated approximately 90¿ with respect to the pole for stable South America. The batholith on Aruba yields a pole which is rotated clockwise over approximately 20¿ with respect to the South American pole. Thus, our data strongly support the hypothesis that Aruba and Bonaire have been rotated clockwise by as much as 90¿ since the Late Cretaceous. In addition, paleolatitudes calculated from the inclinations of the paleomagnetic vectors suggest that there was a northward drift with respect to South America of perhaps as much as 10¿ of the islands during the rotation, although this can hardly be called a statistically significant amount.