Lieutenant Greg Agalsoff was a 24th century Human Starfleet officer.
In 2371, Agalsoff was assigned as a crewman aboard the Federation starship USS Voyager shortly before that vessel was trapped in the Delta Quadrant. (ST video game: Captain's Chair)
Agalsoff had previously been assigned to Starfleet Operations, where he had served on the teams that helped construct and design such ships as the USS Prometheus and the USS Pasteur. (TNG episode: "All Good Things..."; VOY episode: "Message in a Bottle")