"Space fleet" redirects here. For the Games Workshop board game, see Space Fleet.
This is an incomplete list that may never be able to satisfy particular standards for completeness. You can help by expanding it with entries that are reliably sourced.
A space navy is a fictional military service arm tasked with waging battle in or exploring space. It usually has parallels (e.g. ranks, jargon, ship classification) with contemporary ocean-going navies.
Imperial Star Forces - Under the Command of the Humankind Empire of Abh
The United Mankind Naval Space Forces - Under the Command of the United Mankind (in the war which encompasses all three parts to the series, "The United Mankind" references the four space "countries" at war with the Ahb Empire pooled together under the conditions of the "Nova Sicily Treaty.") All space navies against the Ahb are thus collectively known, in a general sense as the "United Mankind."
People's Federation Space Forces - Under the command of the "Peoples Federation of Planets."
Hannia Space Naval Forces - Under the command of the "Federation of Hannia."
Space Forces of Alculnt - Under the command of the "Greater Republic of Alcunlt"
EVE Online - The four main political factions: Gallente Federation Navy, Caldari Navy (with various megacorporate security fleets), Imperial Navy (aptly-nicknamed Golden Fleet) of the Amarr Empire, and the Minmatar Republic Fleet (an assorted combined force of tribal militaries). The fifth mysterious faction, the Jovian Empire, also has a navy though little is know about it aside from a brief confrontation between the Jove Navy and Imperial Navy, which resulted in the complete annihilation of the Amarrian armada.
Space-Navy! (2009) - The titular Space Navy as well as the Etrusculan Star Guard.