The H.I.V.E. Tower is a tower which houses the H.I.V.E. Five, a group of students lead by Jinx, all of whom had once attended the H.I.V.E. Academy. It is similar to the Titans Tower, having its own power plant, a TV used for video games, a computer containing a lot of data, and possibly a kitchen in the living room.
In the episode Mother Mae-Eye, the gang includes Jinx, Gizmo, Mammoth, See-More and Private H.I.V.E. When the H.I.V.E Five reappear in later episodes, the members consists of Jinx, Gizmo, Mammoth, See-More, Kyd Wykkyd, and Billy Numerous (sometimes with a small number of clones). All of these members have lived in the H.I.V.E Tower at some stage in the series.
However after Jinx left the H.I.V.E. Five to pursue a life of good with Kid Flash, the H.I.V.E Five were soon defeated and flash frozen by Jinx and the other Titans during the battle with the Brotherhood of Evil.
Even after they escaped their frozen imprisonment, the tower was not seen again and it is unknown if it is still used by them.