Using fibulin-1 cDNA probes, we performed fluorescence in situ hybridization to map the human chromosomal location of the gene encoding the extracellular matrix and blood glycoprotein, fibulin-1 (FBLN1). The gene for fibulin-1 was mapped to a single site on the long arm of human chromosome 22 (22q13.3). The assignment of the chromosomal map position for the fibulin-1 gene will aid in the evaluation of its potential roles in human connective tissue and blood diseases.