The present disclosure relates to a modular connector assembly and a base station antenna. The modular connector assembly comprises a support and a plurality of connectors mounted on the support. The support is configured as a one-piece support and provided with a plurality of through holes for mounting of the connectors. Each connector is configured to be formed of a first component and a second component that are connectable to each other. The first component and the second component of each connector are located on opposite sides of the support, respectively, are connected to each other by passing through the through holes in the support, and sandwich the support therebetween, thereby fixedly mounting each connector to the support.