A combination marine horn and bow light is provided. According to the invention, a single unit houses a bow light assembly affixed to a housing which contains a sound emitting portion of the horn. The bow light and sound emitting portion of the horn are preferably mounted on the top surface of a boat bow deck. The horn is installed below the bow deck surface. The entire unit is powered by a single electrical supply. Alternatively, separate bow light and horn units may be affixed to the deck or hull sidewalls. In this embodiment, each bow light would have a separate colored lens cover. In a further embodiment, for either deck or sidewall mounting, the light and horn combination, including the sound emitting and sound producing portions, are all mounted on the exterior of the vessel.