Millbrook is a suburb and former civil parish of Southampton, in the ceremonial county of Hampshire, England. As the area developed, several settlements grew within the parish, some of them becoming parishes in their own right, thus reducing the extent of the Millbrook parish. As well as the Millbrook of today, the original Millbrook parish included Freemantle, Regents Park, and Redbridge. Some of these areas are still referred to as being part of Millbrook. The brook that Millbrook was named after is now known as Tanner's Brook.