The House Finch, Carpodacus mexicanus frontalis (Say), is a small seed-eating passerine found throughout western North America. It was introduced to Hawaii, probably from San Francisco as an escaped cage-bird, prior to 1870 (Grinnell 1911). Today it is found on all the main Hawaiian islands. This was a field study of the nesting biology of the House Finch from January 1972 through July 1974, covering three nesting seasons. Some of the findings are discussed in relation to what is known about House Finch populations in North America.