The MacGregor System was a star system in the Republic of Haven.

In the early 1910s PD, it had a population of about two billion and was one of the few systems in the People's Republic with a positive cash flow. It protected the northeastern flank of the Barnett System and was captured by the Alliance in the Battle of MacGregor during Operation Buttercup. (HH6, HH9)

The Republic of Haven Navy retook it as part of Operation Thunderbolt in 1919 PD. (HH10)