- ColombiaA country in South America. Official name: Republic of Colombia. Capital: Bogotá.
- colomboThe commercial capital and largest city of Sri Lanka.
- columbiadA form of cannon from the 19th century, mostly used for seacoast protection. It is a large-caliber, smoothbore, muzzle-loading cannon designed for launching shot or shells with heavy charges of powder, at both high and low angles of elevation.