Abstract: A fence gate support device which in its broad embodiment comprises a pair of first and second post members which, when driven into the ground and clamped together with upper and lower clamp bars, provide a lateral stabilizing first unit for a gate adapted to hang on gate hinge pins affixed to the clamp bars. A fence line stabilizing second unit is provided and has a third post member having a connector on one end and having its other end adapted to be driven into the ground at a distance of several feet from the first unit generally along the fence line and then bent to an angle appropriate to slide the connector over the top of one of the first or second post members. A locking mechanism is provided on the connector and on the third post member such that the connector cannot slide any substantial distance on the third post member when the locking mechanism is engaged.