Even after the contribution of Wilbur (1987) and several recent reports in Western Birds, the distribution of many birds in Baja California remains poorly known. Here we report observations made by us, separately or together, between 1975 and June 1994. We include data only for northwestern Baja California—that is, the region between the international border and Río del Rosario, and west of the summits of the Sierras Juárez and San Pedro Mártir. Almost all records are based on sight identification only, owing to the difficulty—even for Mexican citizens—of complying with current collecting regulations in Mexico.