A ball hitch coupler permits self-latching with a ball hitch. The ball hitch coupler has a housing with a generally downwardly facing open socket for receiving a ball hitch. A ball clamp member within the open socket is attached to an adjustment lever by a clamp rod that extends through a top surface of the housing. A camming surface provided on the lever causes the clamp rod to pull the ball clamp member upwardly and outwardly from the socket as the lever is pivoted to an open position. When the lever is in a neutral ready position, a ball hitch may be inserted into the socket and will automatically be coupled with the ball hitch coupler without further adjustment.