Ursa Major Lacus is a planetary body in Federation space, in the Alpha or Beta Quadrant, visible from Sol in the Ursa Major constellation. Ursa Major Lacus is the location of an annex of the Galactic Historical Archives of the Federation.

Upon the retirement of Starfleet Captain James T. Kirk, many logs of the starship USS Enterprise were transcribed for the Archives on Ursa Major Lacus by archivist Alan Dean Foster. (TAS - Star Trek Logs novelization: Star Trek Log Nine)